Christopher Moltisanti (Michael Imperioli) carries a suppressed Beretta 92FS during the opening robbery in A Hit is a Hit (1.10). Paulie (Tony Sirico) uses a Beretta when he is pulled over by a policeman he is friendly with in The Happy Wanderer (2.06) and when he, Tony, and Silvio execute Pussy in Funhouse (2.13). Christopher's hitmen use Berettas to shoot Credenzo Curtis and Stanley Johnson in the Meadowlands in Whitecaps (4.13). Tony uses a suppressed Beretta during "the thing" he is told to do during his dream in The Test Dream (5.11). Vito Spatafore (Joseph R. Gannascoli) packs a Beretta 92FS when he goes on the lam in Mr. and Mrs. John Sacrimoni Request... (6.05).
Beretta Inox
Silvio Dante (Steven Van Zandt) also uses one to kill Adriana La Cerva (Drea de Matteo) for going to the FBI in Long Term Parking (5.12). Phil Leotardo (Frank Vincent) draws a Beretta Inox when he pays a visit to Tony Blundetto's hideout in All Due Respect (5.13)
Browning Hi-Power
When going to visit his Uncle Junior in Meadowlands (1.04), Tony Soprano (James Gandolfini) checks his Browning Hi-Power before entering, heeding Junior's previous advice to "come heavy or not come at all".
Colt Commander
Christopher Moltisanti (Michael Imperioli) uses a Colt Commander when drunkenly shooting at Tony's car in Irregular Around the Margins (5.05).
Colt Mk VI Series 80
In Sentimental Education (5.06), Carmela (Edie Falco) takes a Colt Mk VI Series 80 1911 Tony keeps hidden in the house and sticks it underneath a pillow before going to sleep.
CZ-83
One of the Russian gangsters who intimidates Christopher in Denial, Anger, Acceptance (1.03) carries a CZ-83, which he reveals to be unloaded.
Desert Eagle
Christopher Moltisanti (Michael Imperioli) uses a Desert Eagle during a truck hi-jacking in 46 Long (1.02) to hold up the driver (Charles Santy). His rapper friend Massive Genius (Bokeem Woodbine) also has a customized Desert Eagle with a scope attachment.
Glock pistols are the most used guns on the show. Christopher Moltisanti (Michael Imperioli) uses a Glock 19 to kill Emil Kolar in the pilot episode. Brendan Filone (Anthony DeSando) uses two different Glock 19s during the truck hijackings in 46 Long (1.02). One of his other hijackers, Special K (J.D. Williams), during the second job drops his Glock, killing the driver Hector Anthony (Manny Silverio). Mikey Palmice (Al Sapienza) uses a Glock to shoot Brendan Filone in episode 3. One of the hitmen that attack Tony has a two-tone 9 mm Glock in Isabella (1.12). Silvio Dante (Steven Van Zandt) uses a suppressed two-tone Glock during the Jimmy Altieri hit in I Dream of Jeannie Cusamano (1.13). Gigi Cestone (John Fiore) shoots Philly Parisi (Dan Grimaldi) in the car in Guy Walks Into A Psychiatrist's Office... (2.01) with a Glock. Matt Bevilaqua (Lillo Brancato) and Sean Gismonte (Chris Tardio) use 9 mm Glocks in their assassination attempt on Christopher in Full Leather Jacket (2.08). Subsequently, Tony Soprano and Big Pussy (Vincent Pastore) each use a Glock when pumping bullets into Matt in the next episode From Where to Eternity. Jackie Aprile, Jr. (Jason Cerbone) carries a Glock in Season 3, most notably using it when robbing Christopher's card game. Eugene Pontecorvo (Robert Funaro) uses a Glock when Christopher assigns him to the assassination in Members Only (6.01). Cary de Bartolo (James Vincent Romano), one of Paulie's guys, uses a Glock during the raid on the Colombian drug-laundering scheme in Mayham (6.03). Bobby (Steven R. Schirripa) uses a Glock to shoot an aspiring rapper to help his career in The Fleshy Part of the Thigh (6.04). Christopher fires a during his impromptu wine hiajcking with Tony Soprano in The Ride (6.09). Gerry Torciano (John Bianco) is killed by a Glock-using hitman in Stage 5 (6.14). Hoodlums with Glocks are used to kill Doc Santoro (Daniel P. Conte) and his bodyguard in Remember When (6.15). Christopher shoots J.T. Dolan (Timothy Daly) with a Glock in Walk Like a Man (6.17). The hitmen that clipped Bobby in the toy store in The Blue Comet (6.20) use Glocks. In the same episode, Glocks are used by Italo to kill Phil's comare and her father, and one of the hitmen that shoots Silvio Dante.
Glock 22
Most of the FBI agents during the raid on Johnny Sack's house in All Due Respect (5.13) carry .40 caliber Glock 22s.
Glock 23
A .40 caliber Glock 23 is seen multiple times throughout the series being carried and used by Tony, as well as others. Paulie (Tony Sirico) uses one while chasing Valery, one of Slava's guys, through the woods in Pine Barrens in the third season.
Jericho 941
One of Tony's men draws a two-tone Jericho 941 while in hiding in Made in America (6.21).
Kahr K9
Walden Belfiore (Frank John Hughes) uses a Kahr K9 to kill Phil Leotardo (Frank Vincent) at a gas station in Made in America (6.21). This was the 92nd, and final, murder of the series.
M1911A1
During the making on Jon Favreau's movie in D-Girl (2.07), Sandra Bernhard uses a suppressed M1911A1. Christopher (Michael Imperioli) carries a 1911 when he and Paulie are lost in the woods in Pine Barrens (3.11). One of the FBI agents arresting Johnny Sack in All Due Respect (5.13) also carries a 1911. Paulie (Tony Sirico) shoots a Colombian drug dealer with his 1911 in Mayham (6.03) and to intimidate Jason Barone (Chris Diamantopoulos) in The Fleshy Part of the Thigh (6.04). During the editing process of Christopher's film Cleaver in Stage 5 (6.14), Daniel Baldwin can be seen brandishing a 1911.
Ruger Mk II
"Fred Peters" (Tony Ray Rossi), the ex-mobster in the Witness Protection Program, carries a Ruger Mk II Pistol, which he contemplates killing Tony with in College (1.05).
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Ruger Speed Six Snub
Christopher uses a snubnose Ruger Speed Six when robbing a college benefit concert with Jackie Aprile Jr. in Fortunate Son (3.03). In a 1982 flashback, a young Tony Soprano uses a snubnose Ruger Speed Six to commit his first murder, a bookie named Willie Overall (Herbert Rogers) in Remember When (6.15). Tony also uses one to pistol-whip and beat up Coco, one of Phil's guys, for intimidating his daughter.
SIG-Sauer P225
Furio (Federico Castelluccio) uses a SIG-Sauer P225 to shoot out the kneecap of someone who owes Tony money in Big Girls Don't Cry (2.05). Bobby Bacala Sr. (Burt Young) uses a P225 when he is sent to kill Mustang Sally (and his friend Carlos) in Another Toothpick (3.05). Carlo Renzi (Louis Crugnali) uses a P225 when he, Jackie, and Dino rob Christopher's card game in Amour Fou (3.12).
SIG-Sauer P226
Paulie (Tony Sirico) uses a SIG-Sauer P226 with a suppressor in A Hit is a Hit. An FBI agent busting into Pussy and Jimmy's bar in Nobody Knows Anything also carries a P226. Janice Soprano (Aida Turturro) kills Richie Aprile (David Proval) with a SIG-Sauer in The Knight in White Satin Armor (2.12). Tony uses a P226 to kill Pussy in Funhouse (2.13). One of the Colombian drug dealers in Mayham (6.03) uses a SIG, which is then picked up and used by Cary de Bartolo (James Vincent Romano).
SIG-Sauer P228
Tony Soprano (James Gandolfini) takes a SIG-Sauer P228 out of his ceiling during the indictments in The Legend of Tennessee Moltisanti (1.08), hiding it in a hat box at his mother's nursing home apartment. Mikey Palmice uses a P228 to kill Donnie Paduana inside his car in Isabella (1.12). In that same episode, one of Tony's assassins uses a P228. One of Phil's gunmen uses a P228 to shoot Silvio Dante in The Blue Comet (6.20).
Smith & Wesson 4043
Big Pussy (Vincent Pastore) uses a suppressed Smith & Wesson 4043 when he and Paulie go to see Jerome and Arnaz in 46 Long (1.02). A truck hijacker with Brendan Filone uses one later in the same episode, holding it "gangster-style" until Brendan angrily corrects him.
Smith & Wesson 5903
Christopher Moltisanti (Michael Imperioli) carries a Smith & Wesson 5903 throughout the show. It is the one he uses when killing Mikey Palmice and various other times. Silvio uses a 5903 when he, Paulie, and Tony kill Pussy in Funhouse (2.13).
Smith & Wesson Model 10
Salvatore "Mustang Sally" Intile (Brian Tarantina) keeps a Smith & Wesson Model 10 with a 3" barrel in his waistband, attempting to draw it as Bobby Sr. attacks him.
Richie Aprile (David Proval) carries a Smith & Wesson Model 36, seen most notably in Bust Out (2.10). Jackie Aprile, Jr. (Jason Carbone) is given a Model 36 by his uncle Ralph (Joe Pantoliano), who tells him the .38 isn't very intimidating but is very reliable and will "always get the job done". Corrado "Uncle Junior" Soprano (Dominic Chianese) shoots Tony Soprano in the stomach with a Model 36 during a case of mistaken identity in Members Only (6.01).
Phil Leotardo (Frank Vincent) holds a Smith & Wesson Model 686 Snub on Lorraine Calluzzo (Patti D'Arbanville) in Where's Johnny (5.03), firing it at her chest through a phone book (but only getting to the 'R' section). Tony Soprano (James Gandolfini) holds one on Christopher in Irregular Around the Margins (5.05) when Christopher holds his own gun on him and accuses him of sleeping with his girlfriend.
Taurus PT945
Christopher Moltisanti (Michael Imperioli) shoots the bakery clerk in the foot with a Taurus PT945 in The Legend of Tennessee Moltisanti (1.08).
Walther PPK
During the making of Jon Favreau's movie in D-Girl (2.07), Janeane Garofalo is shown using a suppressed Walther PPK. That looks a bit more like a black Sig Sauer P230 to me.
Walther PPK/S
Christopher Moltisanti (Michael Imperioli) carries a Walther PPK/S in an ankle holster in the second season episode Full Leather Jacket (2.08) when he is shot at by Matt Bevilaqua and Sean Gismonte. One of the shots he fires from it hits Sean in the head, killing him. Silvio Dante (Steven Van Zandt) also uses a PPK/S in The Blue Comet (6.20) while trying to defend himself from Phil's killers.
Micro Uzi
Tony Soprano (James Gandolfini) gives his wife Carmela (Edie Falco) a Micro Uzi to hide when he hears about the indictments in The Legend of Tennessee Moltisanti (1.08). He later stashes it under some clothes in a box in the closet of his mother's retirement home apartment.
Uzi
Several Uzi submachine guns are found by the FBI under Pussy Bonpensiero's pool table during the bar raid in Nobody Knows Anything (1.11).
AK-47
In Pilot (1.01), Carmela (Edie Falco) confronts a presumed burglar outside her house at night with an AK-47. Several AKs and variants are discovered by FBI agents under Pussy's pool table during the bar raid in Nobody Knows Anything (1.11).
Armalite AR-10
Bobby Bacala (Steven R. Schirripa) gives Tony Soprano (James Gandolfini) an Armalite AR-10 for his 47th birthday in Soprano Home Movies (6.13). Bobby describes the weapon as "800 rounds per... Panther-fluted barrel." It appears to be a DPMS rifle not an Armalite which might give some meaning to the panther line. Tony keeps this weapon when he goes into hiding in The Blue Comet (6.20) and Made in America (6.21). Although Bobby specifically refers to the weapon as an AR-10, he is certainly not a qualified weapons expert.
Closeups of the gun hint that the gun used in show was actually an AR15 with a magazine modified to look like the AR10. Another curious feature is the gun's vertical foregrip, which appears to be cast from the grip of a Beretta M9 (92FS) handgun. It's entirely possible the foregrip was fabricated by the propmaker.
Custom Norinco Type 56-1
In A Hit is a Hit (1.10), Christopher's rapper friend Massive Genius (Bokeem Woodbine) has a nickel-plated Norinco Type 56-1 with ivory furniture (including a Romanian AIM-style vertical grip). This weapon was originally made for the movie Belly, and it was also seen in Lord of War.
Norinco Type 84S
In Two Tonys (5.01), Tony, Benny Fazio (Max Casella), and Little Paulie Germani (Carl Capotorto) each handle a Norinco Type 84S to defend Tony and Carmela's home from a bear.
Winchester Model 70
Artie Bucco (John Ventimiglia) holds a Winchester Model 70 (with scope) up to Tony after he finds out Tony burnt down his restaurant in the first season episode I Dream of Jeannie Cusamano. Bobby Bacala (Steven R. Schirripa) carries a similar rifle when helping Tony look for Paulie and Christopher in Pine Barrens (3.11).
Beretta DT-10
Tony presents Carmela's father Hugh DeAngelis (Tom Aldredge) with a 12-gauge Beretta DT-10 O/U shotgun with a 28 inch barrel for his 75th birthday in Marco Polo (5.08).
Ithaca 37
Tony Soprano (James Gandolfini) uses a 12 gauge Ithaca 37 pump-action shotgun to kill his cousin Tony Blundetto (Steve Buscemi) in All Due Respect (5.13), leaving it at the scene of the crime.
Remington 870
An FBI agent who bursts into Jimmy and Pussy's bar in Nobody Knows Anything (1.11) has a Remington 870 with black synthetic furniture.
Remington 870 Folding Stock
In The Legend Of Tennessee Moltisanti (1.08), Tony is seen taking a Remington 870 Police Magnum equipped with a top-folding stock from a cash/gun stash in a ceiling air duct opening in his house and putting it in a duffel bag as part of his 'spring cleaning' in anticipation of a police raid. He later stashes it under some clothes in a box in the closet of his mother's retirement home apartment.
sawed-off double-barreled shotgun
Tony Soprano (James Gandolfini) keeps a lupara shotgun in the console of his Cadillac Escalade, most notably seen in Walk Like a Man (6.17).
Mk 2 hand grenade
Benny Fazio (Max Casella) spots a Mk 2 hand grenade inside a secret compartment in the Soprano home where Tony and Carmela keep an Type 84S and a M1911A1.
Bobby Bacala (Steven R. Schirripa) uses a Beretta non-gun in Soprano Home Movies (6.13) to carry out a hit for Tony's French-Canadian friends. In the same episode, a flashback to Johnny Sack's arrest in 2004 shows Tony (James Gandolfini) throwing a pistol into the snow, which a neighbor kid retrieves later that night. Strangely, the pistol resembles a Glock-type weapon when it is thrown by Tony, but is a Beretta non-gun when it is recovered.
Ally Boy Barese uses a Colt .45 non-gun in Amour Fou (3.12) to execute Dino Zerilli after the card game robbery attempt. In the same episode, Patsy Parisi (Dan Grimaldi) holds a 1911 non-gun to Gloria Trillo (Annabella Sciorra) when she refuses to stay away from Tony. Tony Blundetto (Steve Buscemi) uses one when shooting Phil during The Test Dream and Phil's brother Billy in Long Term Parking (5.12).
Non Descript Pocket Pistol
Vito Spatafore (Joseph R. Gannascoli) uses a small caliber semi automatic pistol to shoot Jackie Jr in Army of One (3.13).
Walther PPK
Christopher Moltisanti (Michael Imperioli) pulls out a non-gun when Jackie Jr.'s card game heist goes awry, using it to kill Carlo Renzi inside and execute Dino Zerilli outside (with Ally Boy Barese).