Frank Castle (Thomas Jane) uses a pair of heavily customized Colt M1911A1s as his main sidearms in the film. His father Frank Castle Sr. (Roy Scheider) devoted some dialogue to the guns, commenting on how he bored the chambers, customized the triggers, and added some thread-on compensators. Some of the other noticable feattures are their Novak night sights, their bevelled magazine wells, combat hammer and combat triggers, extended slide stop safeties and extended slide releases, as well as a beavertail grip safeties and front cocking serrations.
Frank Castle is seen using an M4A1 fitted with an M203 grenade launcher and an aimpoint M68 red-dot sight when assaulting Howard Saint's club Saints and Sinners. He loses use of this weapon when a bullet from enemy fire hits the reciever and ruins the gun.
Howard Saint (John Travolta) is seen using a Beretta 92FS Inox "Flashpaper" gun, which is designed to imitate the flash and smoke of a blank gun minus the loud sound and dangerous wad which fires from the barrel. Instead of swapping to a real Beretta, it appears to stay a flash-paper gun throughout the film, so I'm seperating it from the real Inoxes used.
The stainless steel Beretta 92FS Inox makes several appearances in the film in the hands of nameless thugs. The most notable user is Dante (Marc Macaulay), one of Saint's hired thugs, who tries to draw it when facing Castle with Spoon (Terry Loughlin) at his side in the Saint building.
When Bobby Saint (James Carpinello) tries to impress his father by buying guns, he meets with Otto Kreig (Frank Castle under-cover), who shows Bobby 4 suitcases loaded with Heckler & Koch G36C assault rifles. I didn't both adding all 4 suitcases because it looks like they just reuse the same shot 4 times and flipped it twice.
When the FBI raids the weapons transfer, Otto Kreig (Frank Castle under-cover) draws a tutone Colt Officers ACP which apears to be customized, before being "killed".
Several of Micro Uzis are seen used by Saint's men when they massacre Castle's family. Most notabley seen using them are Dante and Spoon when they both fire their Micros at Maria Castle's (Samantha Mathis) car, and manages to flip it with them.
When Saint's men massacre Castle's family, one of the hitters is armed with a sawed-off Mossberg 500 shotgun, which looks to be a smooth-bore gun based on the raises ribbing for adding a sight (which is usually used for bird guns to make swing-shooting easier.) Castle picks up this hitter's Mossberg and arrives too late to save his wife and son, finding them dead on the docks after being run over. When the people who killed them pull back around in their Ford pickup truck, Castle fires off four shots, which pattern like buckshot rounds, before running dry. When Castle first begins firing, he clearly racks a live round from the chamber, which would have greatly helped him out when he faces the men as they exit the truck. While the ribbing on the barrel is usually used for bird guns, it is not likely used as a one because bird shotguns have a 2 round cut-off in the mag tub (making a round in the chamber 3 rounds, the maximum capacity allowed for bird hunters). Since the gun is clearly seen loaded with 5 rounds, it is assumed it is used precisely as a gun to fire buckshot. (Then again, most bird hunters don't used sawed-off shotguns anyway).
Lincoln (Tom Nowicki) uses an Ithaca 37 shotgun with nickel plating and a pistol grip throughout the film. It is not a Stakeout model, as it is too long. When using it to shoot Castle's vest in the dance club, he puts two 12 gauge rounds into his kevlar body armor from less than 10ft away, in which case as bullet-proof vest would do nothing to stop those rounds from penetrating. Instead, they just leave big holes where the kevlar is completely gone.
Some of the hitters who help massacre Castle's family are armed with TEC-9s, which clearly have sling swivels (although these shots don't show them), which a TEC-DC9 lacks. They were likely converted to full-auto by the armorer for the film.
When the hitters begin to massacre Castle's family, Castle Sr. takes out two Savage/Stevens 311As for himself and Frank. The two both uses them to great effect and Castle scores two kills with his, one of which by means of blowing up a propane tank on a grill. They are smooth-bore shotguns because they are clearly seen loading birdshot shotgun rounds into them. Based on slight difference in the trigger guard and pistol grip/tang area, these appear to be Spanish Eibar copies.
Castle appears to saw down one of his 311As later in the film, and turns it into a sawed-off shotgun. Castle brings this gun with him when he raids Saint's club, holstered on his back, and manages to kill one of his thugs with it.
Several thugs in the film are seen armed with Steyr SPP pistols, which appear to be converted to full-auto based on the one instance it is seen firing.
Spoon (Terry Loughlin) is seen with a Heckler & Koch USP handgun in his holster when facing Castle in the Saint building. Based on the length of the grip, it looks the the .45 ACP model, the USP45.
One of the arms dealers is armed with a Cobray M11/9 when the FBI raids the exchange. Bobby Saint points his gun at him by mistake and is shot by him in return.
The Glock 17 2nd generation is seen multiple times in the film by nameless thugs but is most notabley seen used by Jimmy Weeks (A. Russell Andrews), who they delve deeper into character-wise in the extended cut.
One of the weapons seen in Castle's arsenal is a chrome slide Glock 18 3rd Generation. (while it is not confirmed as a Glock 18, the 33 round magazine and stock indicate it possibly is.) Sadly, he is never seen using it despite being seen preparing it before leaving to assault Saint's club.
One of the thugs in Saint's dance club is seen using a compact Glock 19 2nd generation, which based on the angle appears too short to be the same Glock 17 used in other scenes.
Harry Heck (Mark Collie) is seen using what looks like an Armsel Striker or possibley a Protecta (the front of the drum is not visible so it is hard to tell) to fire shots at Castle's Pontiac GTO, but he luckily has metal shields that slide up over the windows to protect himself.
