Murderers' Row is a 1966 spy comedy directed by Henry Levin. It's the second of four films about the adventures of superspy Matt Helm (portrayed by Dean Martin), preceded by The Silencers (also released in 1966) and followed by The Ambushers (1967) and The Wrecking Crew (1969).
Loosely based on the Donald Hamilton novel of the same name, the film follows Matt as he must rescue a kidnapped Dr. Solaris in order to prevent an attempt of Bureau of International Government and Order ("BIG O"), usual "bad guys" of Matt Helm series, to create a heliobeam weapon of mass destruction that is planned to be used to destroy Washington, D.C.
The following weapons were used in the film Murderers' Row:
Hy Hunter Bolomauser
Matt Helm's (Dean Martin) main weapon and a valuable plot item is a "ten-second delay gun" that appears to be a Hy Hunter Bolomauser, a pistol version of Armalite AR-7 that was manufactured in the 1960s. The pistol several times passes from Matt to other characters and back again.
MBA Gyrojet Mark 1 Model B
In one scene Coco Duquette (Camilla Sparv) is seen with a "Freezer Pistol" that produces a spray, capable of turning a man into a snowman. Later this pistol is used by Matt Helm (Dean Martin). The gun resembles a Baby Browning though it could be simply a water pistol.
In the scene of the brawl in discotheque a plainclothed French police detective is armed with a pistol that appears to be a Walther PP.
In several scenes various characters are seem with handguns that aren't identified.
In the ending one of the Slaygirls in Matt Helm's apartments holds a M1928A1 Thompson.
The guards in Wall's headquarters carry M1 Carbines, fitted with heat shields, pistol grips, underfolding stocks and M9 flash hiders. In one scene Matt Helm (Dean Martin) fires a captured carbine that produces the sound of full-auto fire (like M2 Carbine) but the holes from the bullets appear with the speed of semi-auto shooting.
A six- (or seven?) barreled pistol is used by Julian Wall (Karl Malden) during the chase on hovercrafts. Though various sources claim it to be a Pepperbox version of Gyrojet, it's most likely a non-functional movie prop (see Discussion page for detailed arguments).
Julian Wall's Armory
In one scene Julian Wall's (Karl Malden) is seen. It contains six bolt action rifles with sniper scopes (supposedly Winchester 70s), two M1 Carbines with folding stocks, three revolvers (unidentified), a pistol (bears resemblance with Remington Model 51 but the grip looks more slim), Webley No. 1 Mark 1 flare gun and MBA Gyrojet pistol. Except Gyrojet, other guns aren't used in action.