Shaw AR-15 6.5 Grendel Threaded Barrel Spiral Flute 20in HBAR Profile 1-8 Twist 5/8-24 Thread Matte Stainless AR15HBSSHF20GRENT2. Shaw is now proud to offer complete barrels directly to consumers. All AR-15 and AR-10 barrels are machined from 416R...