This article currently has one or more unidentified weapons. If you can help identify any of the weapons labelled "unknown," please do so.
NOTE: On occasion Mythbusters shows clips from movies pertaining to the myth they are trying to replicate. Sometimes those clips contain guns. I am NOT including those clips here. If you want to check those guns, look on the page for the particular movie that they mentioned.
The following guns were used in the television show Mythbusters.
In "Hollywood Gunslingers" (S10E12), when talking about quick-draws, Tori is seen with a Beretta 92F. Note that you can see "92F" stamped on the slide so its not a "92FS".
Colt Gold Cup National Match (custom)
In "Boomerang Bullet" (S07E24), a Colt Gold Cup National Match pistol is used to see if a bullet can ricochet back and hit the shooter.
In Wheel of Mythfortune (S9E21), both Adam and Jamie both use the same Colt Gold Cup National Match to test whether action movie shooting stances actually work. Jamie describes it as a "very common gun worldwide."
In "Hollywood Gunslingers" (S10E12), when retesting the ability to dual fire pistols, Adam and Jamie again use two different Colt Gold Cup National Match.
Colt MK IV Series 70
In "Curving Bullets" (S07E10) Tori, Grant and Kari use a Colt MK IV Series 70 to test the technique of curving a bullet demonstrated in the movie Wanted.
CornerShot with Modified Glock
In "Myth Evolution" (S07E18), the CornerShot is used to test the effectiveness of shooting around a corner.
Desert Eagle Mark XIX
In "Mailbag Special" (S10E09), Tori and Kari are seen using a Desert Eagle Mark XIX to test whether a .50 AE bullet can be shot through 25 watermelons.
FEG P9R
In "Mission Impossible Mask" (S09E01), a FEG P9R is used as the target gun whilst testing whether it is possible to shoot at a gun and cause it to slide across the floor.
Flintlock Pistol
In "Paper Armor" (S09E12), Kari, Grant and Tori use a Flintlock Pistol to test how durable their paper armor is. The expert states that it is a French gun from about 1750.
Glock 17
In "Firearms Folklore" (S04E25), Adam and Jamie use the Glock 17 to test the myth that a bullet fired from a Glock lodged backwards in the cylinder of a revolver.
In "Mission Impossible Mask" (S09E01), Tori, Grant and Kari use a 3rd Generation Glock 17 to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
In "Spy Car 2" (S09E07), Tori, Grant and Kari use a 2nd Generation Glock 17 with custom sights to test the myth that if you shoot a bullet into ice it will spin like a top.
Glock 19
In "Hollywood Gunslingers" (S10E12), when testing whether a nail gun could be used as a regular gun, Tori uses a Glock 19 for the control test.
Glock 22
In "Coffin Punch" (S06E19), Adam uses a Glock 22 to test to see if police badges can stop bullets. When Jamie explains the original myth, he said that a police badge stopped a .40 caliber bullet. Although dialogue is not totally reliable, the audience actually sees one of the slugs stuck in one of the badges.
Glock 23
In "Mini Myth Mayhem" (S08E17), the Glock 23 is used, to test weather a hair weave is bulletproof. Unsurprisingly, it is most definitely not. It is also used, in the same episode, to test whether a refrigerator door is bullet proof. In "Inverted Underwater Car" (S08E19), the Glock 23 is used to test whether the muzzle flash from a gun can ignite a room full of gas, as seen in Mr. & Mrs. Smith.
Glock 35
In "Mission Impossible Mask" (S09E01), during the introduction for the test to see if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up Kari brandishes a Glock 35 fitted with target sights, despite the fact a Glock 17 is the gun that is used for the actual test.
Heckler & Koch USP Tactical
In "Blow Your Own Sail" (S09E06), the Heckler & Koch USP Tactical is shown when testing the myth of Hollywood sound effects, testing a .45 ACP pistol un-suppressed. Oddly, the footage of the USP being fired was never shown. Instead, footage of a Walther P22 was shown, labeled incorrectly as a .45.
Modified Glock
In "Myth Evolution" (S07E18), the Mythbusters use a Glock that has been modified to fire special gel markers.
SIG-Sauer P226
In "Bouncing Bullet" (S10E08), Adam and Jamie use a SIG-Sauer P226 to test a myth from Burn Notice that you can bounce a bullet off of pavement through the undercarriage of a car.
SIG-Sauer P226 Combat TB
In "Blow Your Own Sail" (S09E06), Adam and Jamie use the SIG-Sauer P226 Combat TB to test the myth of Hollywood sound effects, testing a 9mm pistol suppressed and un-suppressed. In the HD broadcast the "P226" marking on the handle can be seen as Adam prepares to fire.
SIG-Sauer P228
In "Coffin Punch" (S06E19), a mannequin hand is seen holding a SIG-Sauer P228 during the episode intro.
SIG-Sauer P239
In "Explosive Decompression" (S01E04), Jamie and Adam use the SIG-Sauer P239 to test the myth of explosive decompression on a plane.
In "Bulletproof Water" (S03E10), Jamie uses the SIG-Sauer P239 to test whether water is in fact bulletproof.
In "Shredded Plane" (S04E02), Grant, Tori and Kari use the SIG-Sauer P239 to attempt to start a fire with a gun. They remove the bullet from the round and attempt to use the firing cap to ignite gunpowder.
In "Bullets Fired Up" (S04E07), Jamie and Adam use the SIG-Sauer P239 to test the myth that bullets fired upward can kill on their return trip.
In "Myths Reopened" (S04E08), Grant, Tori and Kari use the SIG-Sauer P239 to test whether you can fire a gun underwater. Amazingly it does fire, it does not however reload correctly.
In "Mega Movie Myths" (S04E19), Grant, Tori and Kari use the SIG-Sauer P239 to see if shooting a lock allows it to be opened.
In "Myth Revolution" (S05E18), Grant, Tori and Kari use the SIG-Sauer P239 to see if a ninja can slap a bullet away.
In "Shooting Fish in a Barrel" (S05E22), Adam and Jamie use the SIG-Sauer P239 to test how easy it really is to shoot fish in a barrel.
In "Coffin Punch" (S06E19), Adam and Jamie use the P239 to test what is bulletproof.
In "Inverted Underwater Car" (S08E19), Grant , Tori and Kari use the SIG-Sauer P239 to test whether shooting through milk will prevent the muzzle flash of a gun from igniting a room full of gas. This is based on the movie Kiss The Girls where Morgan Freeman's character does just that.
In "Spy Car 2" (S09E07), Tori is seen holding the SIG-Sauer P239 when preparing for the myth that a bullet fired into ice will spin like a top. For the actual testing of the myth, they used a Glock.
Smith & Wesson SW99
In "James Bond Special Part 1" (S06E01), Kari uses the Smith & Wesson SW99 to attempt to blow up a propane tank a la James Bond. Note that James Bond's pistol is the Walther P99, not its licensed clone.
Springfield Armory Loaded 1911
In "James Bond Special Part 1" (S06E01), Jamie and Adam use a different Springfield Armory 1911 to test whether James Bond's watch could actually deflect a bullet.
In "Curving Bullets" (S07E10) Tori, Grant and Keri use a Springfield Armory Loaded 1911 to test the the technique of curving a bullet demonstrated in the movie Wanted.
In "Knock Your Socks Off" (S07E12), Adam and Jamie use the gun to test whether a bullet dropped and one fired horizontally hit the ground at the same time.
In "Mini Myth Mayhem" (S07E23), the Springfield Armory Loaded 1911 makes another appearance where they successfully use it to light a match with a bullet.
In "Mission Impossible Mask" (S09E01), Kari uses a different Springfield Armory Loaded 1911 to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
Walther P22
In "Blow Your Own Sail" (S09E06), Adam uses an Walther P22 with a threaded barrel to test the myth of Hollywood sound effects. Hilariously, it is referred to as a .45 caliber rather than the correct .22 caliber in the graphics.
Unknown 1911
The Mythbusters often use a variety of 1911 pistols. The ones listed here are ones that I have not been able to positively identify.
An unknown 1911 pistol, chambered in .45 is used in "Dive to Survive" (S08E03) to test whether a phone books make a car bulletproof.
In "Blow Your Own Sail" (S09E06), Adam uses an unknown, suppressed 1911 to test whether silenced pistols really sound like they do in the movies.
Smith & Wesson 39
A Smith & Wesson 39 is used in the episode "Dive to Survive" (S08E03) in the scene where the crew shoot the phonebook-stuffed car door with a variety of weapons in order to test if it is bulletproof or not. It is referred to as a "9mm".
Revolvers
Colt 1851 Navy
In "Exploding Lighter" (S04E23), the Colt 1851 Navy is used to test a variety of old western myths.
Colt 1860 Army
A Colt 1860 Army is used in "Western Myths" (S05E10) to test the myth that you can shoot a cowboy's hat off.
Colt Anaconda
In "Brown Note, Water Torture" (S03E01) Jamie is seen with a Colt Anaconda .44 Magnum Revolver testing the myth that when you get shot, you fly backwards.
Colt King Cobra
In "Helium Football" (S04E04), a Colt King Cobra is used to test the myth that you can catch a bullet in your teeth.
In "Myths Reopened" (S04E08), Grant, Tori and Kari use the Colt King Cobra to test whether guns fired underwater are still lethal.
In "Mega Movie Myths" (S04E19), Grant, Tori and Kari use the Colt King Cobra to see if shooting a lock allows it to be opened.
In "Exploding Lighter" (S04E23), the Colt King Cobra is used to shoot a hole through a silver dollar.
Colt Police Positive
In "Firearms Folklore" (S04E25), Adam and Jamie use a Colt Police Positive while testing the myth that a bullet fired from a Glock lodged backwards in the cylinder of a revolver.
In "Unarmed and Unharmed" (S07E21), Adam and Jamie use a Colt Police Positive to test whether you can shoot a gun out of someones hand without injuring them.
Colt Single Action Army
In "Exploding Lighter" (S04E23), the Colt Single Action Army makes its debut as we see them actually purchase the gun. It is referred to as the "1873 Peacemaker" and is used to test a variety of old western myths.
In "Unarmed and Unharmed" (S07E21), Adam and Jamie use a Colt Single Action Army to test whether you can shoot a gun out of someones hand without injuring them.
In "Paper Armor" (S09E12), Kari, Grant and Tori use a Colt Single Action Army to test their paper made armor.
Smith & Wesson Model 19
In "Dive to Survive" (S08E03) a Smith & Wesson Model 19 chambered in .357 Magnum is used to test whether filling a car door with phone books makes it bullet proof.
Smith & Wesson Model 29
In "Paper Armor" (S09E12), Adam uses a Smith & Wesson Model 29 to conduct underwater shock wave tests. It has been heavily modified by removing the rear sight(the square cut out for the sights is visible on the top corner of the frame), shortening the barrel and attaching a vertical tube to the muzzle. The gun fires blanks which send a shock wave both up and down.
Smith & Wesson Model 460
The Smith & Wesson Model 460 is used in "Thermite vs. Ice" (S07E08) to test whether holding a hunting revolver improperly will amputate (or injure) the shooter's thumb.
Kari, Grant and Tori use a Smith & Wesson Model 460 in "Bike and Bazookas" (S09E13) to test the scene from Red where John Malkovich blows up an RPG but shooting it in midair.
Smith & Wesson Model 629
In "Inverted Underwater Car" (S08E19), Grant uses what appears to be a Smith & Wesson Model 629 (he states it is a .44 Magnum) to test whether the muzzle flash from a gun can ignite a room full of methane.
In "Mission Impossible Mask" (S09E01), Grant again uses the Smith & Wesson Model 629 to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
Sub-Machine Guns
Heckler & Koch MP5A3
In "Brown Note, Water Torture" (S03E01) Adam is seen with the Heckler & Koch MP5A3 testing the myth that when you get shot, you fly backwards. The announcer erroneously calls the weapon an M4.
In "Mega Movie Myths" (S04E19), Tori uses a Heckler & Koch MP5A3 to test the myth from Underworld that you can shoot a hole in the floor and fall through. The gun is fitted with a collapsible stock and surefire flashlight hand-guards.
Heckler & Koch MP5A4
In "Snow Special" (S05E13) Adam and Jamie use a Heckler & Koch MP5A4 with a full stock and surefire flashlight handguards to attempt to start an avalanche.
Heckler & Koch UMP
In "Dive to Survive" (S08E03), the Mythbusters use a Heckler & Koch UMP with a RIS foregrip and EOTech red dot sight to test the 'bullet-proofness' of their phonebook filled car. It is described as a "UMP40."
M1A1 Thompson
In "Brown Note, Water Torture" (S03E01) Tori is seen with the M1A1 Thompson testing the myth that when you get shot, you fly backwards.
M1928 Thompson
In "Viewer Special 2" (S06E05), Grant uses the M1928 Thompson to try and cut a tree down with a machine gun.
MAC-10
In "Hollywood Gunslingers" (S10E12), while testing the myth of "unlimited ammo", Tori is seen firing an MAC-10.
Uzi
In "Hollywood Gunslingers" (S10E12), while testing the myth of "unlimited ammo", Grant is seen firing an Uzi.
Shotguns
10 Gauge Double Barreled Shotgun
In "More Myths Revisited" (S05E06), an antique 10 Gauge Double Barreled Shotgun is used to re-test the myth that if you plug the barrel of a gun with your finger, it will explode. They used an antique that was made in 1877 using the old Damascus technique of heating narrow strips of metal then shaping them around a mandrel. The theory was that this older, and definitely weaker barrel might fail when the barrel was plugged.
12 Gauge Double Barreled Shotgun
In "Myths Reopened" (S04E08), Grant, Tori and Kari use a 12 Gauge Double Barreled Shotgun to test the lethality of firing a gun underwater. Turns out that a shotgun explodes when fired underwater.
In "Western Myths" (S05E10), a 12 Gauge Double Barreled Shotgun is used to test the myth that you can shoot a cowboy's hat off.
Benelli M1
In "Mini Myth Madness" (S08E17), Kari uses a Benelli M1 fitted with a GG&G charging handle to see if a laptop computer can stop a 12 Gauge birdshot blast at point blank range.
Benelli M4
In "Mission Impossible Mask" (S09E01), Grant, Tori and Kari use a Benelli M4 to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
In "James Bond Special Part 1" (S06E01), a Remington 870 shotgun with Ghost Ring sights is used to try and pierce a propane tank.
In "Coffin Punch" (S06E19), a Remington 870 is used with bird shot, buck shot, and deer slugs.
In "Dive to Survive" (S08E03), Tory uses what appears to be a Remington 870 to test whether phonebooks make a car bullet proof.
Tory can briefly be seen with a Remington 870 in "Mission Impossible Mask" fitted with a muzzle stand-off device, but the shotguns that were used in the test were a Benelli M4 and a Remington Model 1100 Tactical.
Remington Model 870 Field Gun
In "Bulletproof Water" (S03E10) a Remington Model 870 Field Gun is used to test whether water is bulletproof.
In "MythBusters Revisited" (S03E14), the Remington Model 870 Field Gun is again used to retest whether someone flies backwards when shot.
In "Seasickness - Kill or Cure" (S03E19), the same shotgun is used while testing the myth that a gun will explode when the barrel is plugged.
Remington Model 1100 Tactical
In "Mission Impossible Mask" (S09E01), Grant, Tori and Kari use a Remington Model 1100 Tactical to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
Unknown Single shot shotgun
An unknown single shot, 12-gauge shotgun was used by Grant in "Mega Movie Myths" (S04E19), to test if you could shoot through a lock.
Machine Guns
Dillon Aero M134 Minigun
In "Viewer Special 2" (S06E05), Kari uses the Dillon Aero M134 Minigun to cut down a tree.
In "Shooting Fish in a Barrel" (S05E22), Adam and Jaimie use the Dillon Aero M134 Minigun.
In "James Bond Special Part 1" (S06E01), Grant uses the Dillon Aero M134 Minigun to blow up a propane tank.
FN Minimi Para
Tory uses an FN Minimi Para in "Viewer Special 2" (S06E05) to attempt to cut down a tree. It is fitted with a heat shield and has the folding rear sight of the first model of FN Minimi indicating that this gun is likely cobbled together from several different weapons. Tory mistakenly identifies the gun as the M249 SAW.
Assault Rifles
Norinco Type 56
In "Coffin Punch" (S06E19), Adam uses a Norinco Type 56 to test if an MP3 player/iPod is bulletproof. It is repeatedly refered to as an "AK-47".
AKM
In "Hollywood Gunslingers" (S10E12), when testing the myth of "unlimited ammo", Keri is seen with a AKM which he and the other Mythbusters refer to as an AK-47.
Colt AR-15 Match Target Competition HBAR
In "MythBusters Revisited" (S03E14), Adam is seen using a Colt Match Target Competition (Model MT6700), a civilian equivalent of the M16A4 with the bayonet lug and flash hider deleted.
Colt AR-15 Match Target Competition HBAR II
In "Bulletproof Water" (S03E10), Jamie uses a Colt AR15 Match Target Competition HBAR II (Model MT6731) with an ACOG scope mounted on the carry handle and Hogue handguard when testing if water is bulletproof.
Colt Model 723
The Mythbusters use a Colt Model 723 carbine with an M4 profile barrel in "Dive to Survive" (S08E03) to test whether phonebooks can be used to make a car bulletproof.
M4A1 Carbine
In "Coffin Punch" (S06E19), Jamie uses an M4A1 Carbine to test if bathroom tiles covered in fiber-reinforced gypsum cement is bulletproof in. It has a C-more CTAC red-dot sight and an ACE ARFX stock.
M16A2
In "Hollywood Gunslingers" (S10E12), while testing the myth of "unlimited ammo", Grant is seen firing an M16A2 with a Magpul PMag magazine.
Rifles
Carcano Carbine
In "Exploding Toilet" (S01E04), Adam and Jamie use a Carcano Carbine to test the mythical 'ice bullet'.
In "Myths Revisited" (S02E01), Adam and Jamie use the Carcano Carbine to retest the 'ice bullet.
In "Seasickness - Kill or Cure" (S03E19), a Carcano Carbine is used to test the myth of a gun exploding when the barrel is plugged.
In "Shredded Plane" (S04E02), Tori uses a Carcano Carbine firing a modified round to attempt to start a fire. He removes the bullet and using a piece of cloth to compact the powder in the shell. The theory was that the cloth would catch fire and then ignite their 'campfire'.
In "Firearms Folklore" (S04E25), a Carcano Carbine is used to test the myth from the Vietnam War of a sniper shooting through another sniper's scope.
Enfield Pattern 1853
An Enfield Pattern 1853 rifled musket is used to test whether Davy Crockett could actually split a bullet on an axe head in "Swimming With Syrup" (S07E05). This choice of rifle is anachronistic, not entering service until 17 years after Davy Crockett's death at The Alamo in 1836.
M1A
In "James Bond Special Part 1" (S06E01), Tori uses a M1A SOCOM 16 with tracer rounds to shoot at a propane tank.
M1 Carbine
In "MythBusters Revisited" (S03E14), Kari is seen using an M1 Carbine to attempt to blow up a gas tank.
M1 Garand
The M1 Garand is another favorite of the show and is often used when a higher caliber is needed.
In "Bulletproof Water" (S03E10), Jamie uses the M1 Garand when testing if water is bulletproof.
In "MythBusters Revisited" (S03E14), Grant is seen using the M1 Garand to attempt to blow up a gas tank.
In "Jaws Special" (S03E17), Adam and Jamie use the M1 Garand to try to blow up a scuba tank as seen in Jaws.
In "Bullets Fired Up" (S04E07), Adam and Jamie use the M1 Garand to test the myth that bullets shot upward call kill when they fall. In this episode, the announcer mistakenly referred to it as the '30.06 assault rifle.
In "Myths Reopened" (S04E08), Grant, Tori and Kari use an M1 Garand to test the lethality of a bullet fired underwater.
In "Mega Movie Myths" (S04E19), Grant uses the M1 Garand to shoot through a lock.
In "More Myths Revisited" (S05E06), Adam and Jamie use an M1 Garand to reattempt the myth from the Vietnam war that a sniper killed his Vietcong counterpart by shooting him through his scope.
In "James Bond Special Part 1" (S06E01), Kari, Grant and Tori use the M1 Garand to try and blow up a propane tank.
In "Dive to Survive" (S08E03), the Mythbusters use the M1 Garand to do a shop test to see how many phonebooks it would take to stop a "high powered" bullet. The narrator mistaking refers to rifle as a M14 and there is also a continuity error as the Mythbusters had been using the M14 earlier in the episode. In the end, for some unknown reason, they end up switching to the M1 Garand.
In "Hollywood Gunslingers" (S10E12), when testing myth of silver bullets and bullets with engravings, Grant is seen holding the M1 Garand. In the end he has a trained marksman perform the actual test.
M14
The Mythbusters use an M14 in "Dive to Survive" (S08E03) to test whether phonebooks can be used to make a car bulletproof.
M1903 Springfield
In "Ancient Death Ray" (S02E04), Adam and Jamie use a M1903 Springfield to test how bulletproof bulletproof glass is.
Mosin Nagant M91/30
In "More Myths Revisited" (S05E06), Adam and Jamie use a Mosin Nagant to reattempt the myth from the Vietnam war that a sniper killed his Vietcong counterpart by shooting him through his scope.
Remington 700
In "Firearms Folklore" (S04E25), Adam and Jamie use a Remington 700 to test the myth of the sniper during the Vietnam War who shot another sniper by shooting through his scope.
Savage 111
A Savage 111 .30-06 hunting rifle is used in "More Myths Revisited" (S05E06) to test the myth that firing a gun with a boresight still installed can cause the gun to 'banana-peel'.
SKS Rifle
In "Thermite vs Ice" (S07E08), the SKS is used to test whether a car stereo can set off a rifle.
Unknown .22 rifles
In "Ancient Death Ray" (S02E04), Adam and Jamie use 2 unknown .22 rifles to test whether different items are bulletproof. I believe the first one is a Marlin. Possible a Marlin Model 25.
Unknown .50 muzzle loader
In "Viewer Special" (S05E15), An Unknown .50 cal, muzzle loader, percussion rifle is used to shoot cigaret butts.
Unknown Musket
In "Song of a Gun" (S03E06), an unknown musket is use to test whether a bullet can transfer sperm.
In "Shredded Plane" (S04E02), the same unknown musket is used to start a campfire by firing a piece of cloth out of the barrel.
In "Firearms Folklore" (S04E25), the musket is used again to test the myth of fusing two bullets fired from different muskets.
Unknown Musket #2
In "Bulletproof Water" (S03E10), Jamie uses an unknown musket when testing if water is bulletproof. They specify that is is Civil War era, black-powder and fires at 1000ft/sec.
Unknown Winchester Rifle
In "Exploding Lighter" (S04E23), an unknown Winchester Rifle (referred to as a 1888) is used to shoot a noose.
Winchester Model 1886
A Winchester Model 1886 rifle is used in "Western Myths" (S05E10) to test the myth that you can shoot a cowboy's hat off.
Sniper Rifles
Armalite AR-50
In "Bulletproof Water" (S03E10), the Armalite AR-50 makes it debut as Jamie and Adam use it to test whether water is bulletproof.
In "MythBusters Revisited" (S03E14), the Armalite AR-50 is again used to retest whether someone flies backwards when shot.
In "Curving Bullets" (S07E10), Adam and Jamie use an Armalite AR-50 to test whether a sonic boom from a gun will shatter glass.
In "Mission Impossible Mask" (S09E01), Grant uses the Armalite AR-50 to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
Barrett M98B
Adam and Jamie use the Barrett Model 98 Bravo in "Dodge a Bullet" (S09E08) to test whether you can jump out of the way of a bullet.
Barrett M99
Tori uses what I believe is the Barrett M99 to shoot up the 'bulletproof car' in "Dive to Survive" (S08E03).
Barrett M107
In "Mission Impossible Mask" (S09E01), Kari uses a Barrett M107 chambered in .416 Barrett to test if you can start a merry-go-round spinning by shooting at it as shown in Shoot 'Em Up.
Desert Tactical Arms SRS
The Mythbusters recruit professional sniper Dave Liwanag to use the Desert Tactical Arms Stealth Recon Scout in "Dodge a Bullet" (S09E08) to test whether it is possible to just out of the way of a bullet after seeing the muzzle flash.
Maadi Griffin
Kari uses a Maadi Griffin Model 99, single shot .50 Cal rifle to shoot up the 'bulletproof car' in "Dive to Survive" (S08E03).
SVD Dragunov
Adam is seen holding the SVD Dragunov in "Dodge a Bullet" (S09E08). Given California gun laws and that the weapon was only used for a one-off scene where no shots were fired, it's possible this was an airsoft replica.
Sako TRG
The SWAT member that assists the crew in testing the phonebook bulletproof car in "Dive to Survive" (S08E03) is seen using a Sako TRG in .338 Lupua Magnum, as Kari states.
Other
Advanced M26 Taser
Adam and Jaimie use the Advanced M26 Taser in "Fireball Stun Gun" (S08E10) to test whether pepper spray + taser = giant fire ball.
Harpoon Gun
In "Phonebook Friction" (S06E12), Grant, Tori and Kari use a harpoon gun to test the final scene from Deep Blue Sea. They have the actual prop from the movie present but use a Greener Light Harpoon Gun (a weapon based on Greener target rifles, themselves originating from the Martini-Henry) to actually test the myth. Tori states that it works by firing a .30 blank.
Mk 2 Hand Grenade
In "Grenades and Guts" (S05E12) Adam and Jamie are seen holding inert Mk 2 hand grenade while discussing the myth that diving on a grenade can save those around you. For the actual test they used a M67 Hand Grenade.
M2 Flamethrower
Jamie uses the M2 Flamethrower in "Fireball Stun Gun" (S08E10).
M67 Hand Grenade
Adam and Jamie use a number of M67 Hand Grenades in "Grenades and Guts" (S05E12) to test whether diving on a grenade can save those around you.
RAP4 T16 Paintball Marker
A RAP4 T16, a paintball marker based an the M4 Carbine, is held by Adam while introducing the myths they will be testing in "James Bond Special Part 1" (S06E01).
RPG-7
Kari, Grant and Tori use an RPG-7 in "Bike and Bazookas" (S09E13) to test the scene from Red where John Malkovich blows up an RPG but shooting it in midair.
Miscellaneous Collections
Grenade Collection
In "Grenades and Guts" (S05E12), a collection of different grenades is shown.
Hollywood Gun Myths
In "Hollywood Gunslingers" (S10E12), various different gun collections are seen.
James Bond Special
In "James Bond Special Part 1" (S06E01) you see a shot of multiple firearms being used by Tori, Grant and Kari to attempt to blow up a propane tank.
Table of Pistols
In the episode "Blow Your Own Sail" (S09E06), a large number of pistols are seen on a table when Adam and Jamie were discussing silenced pistol sound effects in Hollywood movies.
Western Guns
In the episode "Western Myths" (S05E10), a collection of pistols and rifles are seen on a table in preparation for Adam and Jamie testing if you can shoot the hat off a cowboy.