The DeLisle Commando Carbine is one of the coolest special operation weapons of the Second World War – an SMLE rebuilt in .45ACP with a ginormous suppressor. It fed form slightly modified 1911 magazines, and thanks to .45ACP being subsonic in its normal loading, it is incredibly quiet. Because the gun is relatively easy to make (being based on a readily available receiver), one-off and limited-run reproductions have been around for a while, but always hard to find.
US Armament has begun making a serial-production new DeLisle, and they send me one on loan to film. It is very, VERY quiet, and runs more smoothly and reliably than I expected, as the originals have a reputation for being finicky. The reproduction elements are quite good, although not quite perfect in the details (like the muzzle assembly, sights, and handguard). However, I believe the price is quite high for the product.
Original DeLisle video (including folding-stock prototype):
What was the barrel length on the originals?