The typical SMG works by using a 10.5 inch barrel with the normal “chook cage” flash suppressor and typical carbine handguards. The barrel has a chrome lined bore and chamber. The barrel is also created in sixteen-inch length for your industrial/LE carbines. The best part is, You may use 9mm https://colt-10-5-inch-9mm-smg-up19529.blog2news.com/27138501/an-unbiased-view-of-colt-10-5-inch-9mm-smg-upper-receiver-assembly