THOMPSONA(R)1927A-1 LIGHTWEIGHTa Black anodized aluminum alloy frame/receiver a 16.5" blued steel barrel (18" with pinned compensator)a Fixed American Walnut stock with sling swivel pistol grip & vertical foregrip with finger grooves a 20-round stick & 100-round drum includeda OAL: 41" a Wt.: 9.5 lbs. THOMPSON 1927-A1 SHARED FEATURESa Semi-auto .45 ACP carbine reproduced from the original 1927A-1 Thompson engineering drawings a Also known as the "Tommy GunA(R)" or "Chicago TypewriterA(R)" a Blowback operation (fires from closed bolt) a Finned Barrel (cooling fins) a 1 in 16 RH twist a Pinned in front blade a Open rear adjustable sight a Cutts Compensator attached