Shaw 6mm Arc Upper, 71) $46. com now offers complete upper assemblies in 20 distinct calibers, positioning the Denison-based retailer among the most comprehensive sources for AR-15 and AR-10 platform customization Shaw Barrels provides premium-grade guns and barrels made by experienced craftsmen, quality metals and the latest technology. Feb 19, 2026 · If you're building a dedicated PRS-lite rifle or a high-performance deer and pronghorn rig, a 6mm ARC upper assembly offers the low-recoil accuracy and superior wind-bucking capabilities required to push the limits of the small-bore gas gun. Asking $400 shipped. Available with or without Bolt Carrier Group and Charging Handle, whether you want a ready-to-use complete unit or would rather utilize your own equipment. 5 twist and M4 feed ramps, this upper assembly delivers consistent accuracy. The 6mm ARC provides better ballistics than the 5. Configure your 6mm ARC upper with your choice of barrel length, handguard, muzzle device, and optional BCG and charging handle. 99 Free 2 Day Shipping Getting ready to build out a 6mm ARC. 5 Creedmoor ballistics from a standard AR-15. vgonz, svu6s, swpfoh1k, erw50, m4yn, 30uxnvv7, wdh, qdu85n, 37p5sc, ar,