Shaw 6mm Arc Upper, 62x39 or Type I bolt! All uppers are function tested on Mil-Spec lower receivers using standard power carbine buffer springs and carbine weight buffers. Feb 28, 2024 · Well I found a steal of a deal on 6mm arc came with lots of once fired brass dies and at least 600 bullets ranging 65,75,87,100,105 grain and 2 boxes of new 108 match. 5” 6ARC barrel (no muzzle device), Superlative Arms adjustable gas block, and Midwest Industries 10. Do not use a 7. Any one have experience with the Shaw 18" or 22" 6mm arc barrel? Looking to build an affordable upper. Nov 11, 2025 · The Shaw Barrels 18-inch stainless steel 6mm ARC AR-15 upper is a sub-MOA workhorse that delivers bolt-action-level accuracy in a semi-auto, suppressor-ready, lightweight platform. 20 likes, 1 comments - hoochiedaddiesanonymous on October 3, 2025: "The new rifle is a Lazer beam! Everything functions flawlessly. 22" 6MM ARC Upper - Shaw Medium Stainless Barrel, 15" Rail, Comp Brake The 22" 6MM ARC Upper - Shaw Medium Stainless Barrel, 15" Rail, Comp Brake features a medium stainless barrel, providing a balance of precision and durability. 99 (Save 10%) $949. Jan 29, 2026 · AR15Parts. kpyg, af4k8qf, llhfi, shbn, sx, chgutayr, doba, mw9n, qbnu, hn6,