The standard SMG makes use of a 10.5 inch barrel Using the conventional “fowl cage” flash suppressor and standard carbine handguards. The barrel includes a chrome lined bore and chamber. The barrel can be produced in 16-inch duration for that professional/LE carbines. Posted by Phil Herbert on 22nd Apr 2023 https://judahigxmb.blogdon.net/an-unbiased-view-of-colt-10-5-inch-9mm-smg-upper-receiver-assembly-42686866