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The following firearms are used in the HBO series Boardwalk Empire:
Agent Nelson Van Alden (Michael Shannon) fires a Smith & Wesson Model 10 HB (anachronistic for the 1920s era) at the firing range with the other Prohibition agents in training during the pilot episode.
Colt Model 1903 Pocket Hammerless
Jimmy Darmody (Michael Pitt) carries a Colt Model 1903 Pocket Hammerless in a shoulder holster. It is differentiated from the .380 ACP Model 1908 in "Home" (1.07), when Richard Harrow (Jack Huston) asks Jimmy what type of pistol he is carrying and Jimmy responds: "A Colt 1903". In season 4 Nucky Thompson (Steve Buscemi) begins carrying one with pearl grips and nickle plate.
M1911
M1911 pistols are used throughout the series by several characters. Some of Sheridan's men in "Family Limitation" (1.06) carry M1911s. Nelson Van Alden (Michael Shannon) carries one in a shoulder holster. "Chalky" White (Michael K. Williams) uses a matched set of nickel 1911s to capture Meyer Lansky in "The Emerald City" (1.10). Capone (Stephen Graham) uses one for an assassination in "A Return to Normalcy" (1.12). Lansky (Anatol Yusef) himself uses a chrome M1911 during the standoff in "The Age of Reason" (2.06). Clifford Lathrop (Curt Bouril), the Department of Justice agent assisting Esther Randolph, carries a M1911 in a shoulder holster.
After taking control of Atlantic City during the second season, Jimmy Darmody (Michael Pitt) upgrades from a Colt 1903 to a 1911, carried in condition one in a large brown leather shoulder holster.
Eddie Kessler (Anthony Laciura), Nucky's faithful German valet/bodyguard, fires a Remington 1866 Derringer at the D'Alessio brothers when they attempt to kill Nucky in "Belle Femme" (1.09).
Colt New Service
The youngest D'Alessio brother, Pius D'Alessio (Nicholas Martino), desperately attempts to load his Colt New Service in "A Return to Normalcy" (1.12).
Savage 1907
One of Masseria's nephews, Incrocci (Mario Macaluso) threatens Jimmy with a Savage 1907 in New York in "Ourselves Alone" (2.02).
Webley Mk VI
Richard Harrow (Jack Huston) mentions a "Webley .455" as one of his handguns, finally drawing a Webley Mk VI during a showdown with Sleater in "A Dangerous Maid" (2.03).
Lucky Luciano (Vincent Piazza) has upgraded his .32 S&W Hand Ejector to a .45-caliber Smith & Wesson M1917 by 1921 as seen in "The Age of Reason" (2.06). Vito Scalersio, the assassin sent by Capone to Atlantic City, uses an M1917 in "Peg of Old" (2.07).
Smith & Wesson Victory Model
Richard Harrow (Jack Huston) uses a Smith & Wesson Victory Model throughout "To the Lost" (2.12), carried in his waistband. It is differentiated from a standard Model 10 by the grips, finish, and lanyard ring. As the Victory Model was developed for World War II, its appearance in an episode set in the summer of 1921 is an anachronism.
Many characters use full length side-by-side Double Barreled Shotguns throughout the series. Jimmy Darmody (Michael Pitt) uses one when ambushing Rothstein's truck drivers in the pilot episode. Margaret Schroeder (Kelly Macdonald) uses a double-barreled shotgun that she hands off to Nucky (Steve Buscemi) in "Gimcrack and Bunkum" (2.05). In the same episode, a hunter named Glenmore (Bill Camp) also carries one.
Browning Auto-5
Browning Auto-5 shotguns are used by several characters throughout the series. In the pilot episode, Al Capone (Stephen Graham) carries a Browning Auto-5, as do several of Rothstein's drivers and several Prohibition agents. Richard Harrow (Jack Huston) carries a cut-down Auto-5 in "21" (2.01) and "What Does the Bee Do?" (2.04).
Winchester Model 1912 Riot
Several Prohibition agents and some of Chalky's warehouse guards carry Winchester Model 1912 riot shotguns.
Luparas are used in several episodes. Al Capone (Stephen Graham) uses one in "Family Limitation" (1.06) to ambush members of Sheridan's Irish mob. Richard Harrow also uses one against the D'Alessio brothers in the episode "Return to Normalcy" (1.12). In "Battle of the Century" (2.09), Waxey Gordon's assassin Alfred Gordetsky (Scott Burik) uses one against Manny Horovitz.
Winchester Model 1912 Full Length
Richard Harrow (Jack Huston) takes a full size Winchester Model 1912 when he goes "hunting" in "Gimcrack and Bunkum" (2.05). A full size Model '12 is also used by a Klansman in "21" (2.01).
Winchester Model 1897 Riot
A woman who works in Chalky's warehouse uses a riot Winchester Model 1897 in "21" (2.01). Appropriately, Richard Harrow (Jack Huston) uses one when accompanying Jimmy on a revenge mission for the warehouse shooting in "To the Lost" (2.12). Eli Thompson (Shea Whigham) also carries on in "To the Lost" (2.12).
Submachine Guns
M1921AC Thompson
Enoch "Nucky" Thompson (Steve Buscemi) travels to Ireland to sell a shipment of Thompsons to the IRA. The particular model featured is the M1921AC configuration with a 50-round drum magazine of .45 ACP ammunition, not developed until 1926 (anachronistic during a scene set in 1921.)
In "21" (2.01), "Chalky" White (Michael K. Williams) picks one up from a fallen warehouse guard to shoot a KKK member.
M1903 Springfield
During the World War I flashback in "To the Lost" (2.12), Cpl. Jimmy Darmody (Michael Pitt) carries a M1903 Springfield with a bayonet attachment.
Machine Guns
Browning M1917
A Browning M1917 is used by KKK members to assault a liquor warehouse run by Chalky White in "21" (2.01).
Other
Mark I Trench Knife
Jimmy Darmody (Michael Pitt) carries a 1918 Mark I Trench Knife in his left boot. The writers are doing a little bit of homework on this series as when Jimmy is asked what the point on the top of the handle is he says it's a skull crusher and is used for "cracking walnuts."
Colt Percussion cap gun
Eli Thompson (Shia Whigham) works to fix a cap gun resembling a Colt percussion revolver for his son Brian in "Gimcrack and Bunkum" (2.05).