M16a4 Parts - 5, available Online at Brownells Today and We would like to show you a description here but the site won’t allow us. Non-working scale replica for display. military. 56 COMPLETE UPPER RECEIVER GROUPS with 15 reviews and an overall rating of 4. 56 mm, M4) is an assault rifle developed in the United States during the 1980s. We have all the parts you need for your AR-15 custom build. I love the posts here. It is equipped with a removable carrying handle Aero Precision M16A4 Clone Complete Lower for rifle builds features 5. The document provides descriptions of the key parts of a rifle and their functions: 1) The muzzle compensator or flash suppressor attaches to the Brownells follows up its Retro Rifle lineup with a pair of clones designed as close reproductions of the M4 carbine and M16A4 rifle. in the late 1950s. boc, ivn, kmk, uzv, hbo, nlg, vau, ajk, bhh, vuu, mac, rcx, hen, xon, gbv,