ONE HORSE 6MM ARC COMPLETE UPPER RCVR W/HBAR RIFLE BARREL FOR AR-15 Take your AR-15 platform to the next level with this 6mm ARC 18a ^2 Complete Upper Receiver, built for shooters who demand precision, reliability, and extended range performance. Designed around an 18-inch 416R stainless steel barrel with a 1:7.5 twist rate, this upper provides excellent stabilization across the range of 6mm ARC projectile weights, delivering outstanding accuracy for long-range shooting and hunting applications. The free-float M-Lok handguard offers a lightweight and rigid platform that enhances accuracy while allowing shooters to easily mount lights, bipods, and other acc Mfg: One Horse