any know which model?

Colt 635 with a C-More on their gooseneck “scout” mount, and a Wilcox Nightstalker IR grip.
Wilkinson Arms Linda with the AR stock adaptor, C-More red dot, and unknown light and laser on their barrel attachment.

My SPSh-44, probably my most useless purchase, but hell it is only money.

With the exception of the German weapons (I don't know how they got them). All the weapons were at one point, or still are used by the Hong Kong Police. The three long guns to the left are still in service with either newer versions or have attachment upgrades. The Sterling SMG was the primary SMG before the MP5 was imported in the 70s. There are no clear records on the usage of Sten gun but it could have been used immediately post-WW2. The S&W gas/flare gun was most famously used as a tear gas launcher during the 1967 Riots alongside the Webley No4 Mk1 Flare gun. The Webley revolver was the service revolver used up till the 50s or 60s and was replaced by the Colt Police Positive on the bottom right. The short barrel version was likely adopted around the 70s as an detective who started in 1974 mentioned that in the early days CID used the same longer barrel version as the uniformed officers. They are in turn replaced by the S&W M10 and the Colt Detective Special which in turn, was replaced in 2024 and 2008 by the CF98A and the Sig P250 DCc.

Two examples were apparently built for the film. One (used for close-up shots) was apparently equipped with an electric drive to rotate the barrels (its feed system is not visible). The another used for general scenes (identifiable by the bright metal rings on the barrels) uses a DP-27 trigger group and magazines, and appears to fire only from the top barrel.

Rare example of a China Lake 40mm, pump action, mag fed grenade launcher. Spotted in the War Remnants Museum in Saigon (HCMC) yesterday.