Snatch

The following guns were used in the film Snatch:

IMI Desert Eagle Mark VII

Bullet Tooth Tony (Vinnie Jones) famously carries a "Desert Eagle .50" (however, a close inspection of the bore reveals his gun is actually the .357 Magnum version).

IMI Desert Eagle Mark VII .357 Magnum

Bullet Tooth Tony holds his Desert Eagle to Sol's (Lennie James) head

Franchi SPAS-12

Vincent (Robbie Gee) buys a compact version of the SPAS 12 for the heist of Brick Top's (Alan Ford) bookie.

Vincent buys a SPAS 12 for the heist

Smith and Wesson Model 681

Tommy (Stephen Graham), Franky Four Fingers (Benicio del Toro), and Boris 'The Blade' Yurinov (Rade Serbedzija) are all seen with Smith & Wesson Model 681 revolvers.

Looks more like a Smith & Wesson Model 686

It's a 681. The 681 has fixed sights built into the topstrap like the one shown. A 686 has raised adjustable sights that would be clearly visible.

Franky Four Fingers robs the jewelers office of the 84 ct. stone with a Smith & Wesson Model 681

Boris 'The Blade' Yurinov with a Smith & Wesson Model 681

Tommy in Boris 'The Blade' Yurinov's home purchasing a Smith & Wesson Model 681

AK-74M with GP-30

Boris 'The Blade' Yurinov fetches an AK-74M with a GP-30 grenade launcher from his home after escaping capture and being hit by a car.

AK-74M 5.45x39mm with GP-30 grenade launcher 40mm

Heckler & Koch P7M8

when vinny (Robbie Gee) threatens Bullet Tooth Tony ( vinnie jones) he carries a Heckler & Koch P7M8 with black finish. It is implied that the gun is a 'replica' but replicas don't fire blanks that are loud enough to shatter windows (like in the film.

Heckler & Koch P7M8 9x19mm

(Robbie Gee) with his P7M8

Heckler & Koch P9S

The other thug (Lennie James) uses a Heckler & Koch P9S to threaten Bullet Tooth Tony with his friend who is carrying a P7M8.

Heckler & Koch P9S .45 ACP

Sol with his P9S

Colt M1911

Boris the blade shoots Frankie Four Fingers in the head with a Colt M1911.

Unknown revolver

Used by Tyrone and Vinnie throughout the film.

Unknown Sawed-off pump action shotgun

It is seen briefley in the introduction, Boris the Blade pulls it out of his safe and cocks it. It is also seen on a table when Boris sells Franky Four Fingers his revolver, and later it is seen again in Boris' safe when Cousin Avi, and Bullet Tooth Tony raid his home.

It's either a Mossberg 500 Cruiser or a Reminton 870 fitted with a pistol grip. I've seen the film and the gun has a pistol grip.