SASS (Semi-Automatic Sniper System)- Chambered in 6.5 Grendel with a 20-inch Bear Creek Arsenal parkerized heavy barrel with a 1:8 twist and a rifle-length gas system. Over half of the barrel length is bull barrel with a diameter of .980 inches to maintain accuracy at longer ranges with multiple shots. We suggest using Hornady Black 123 grain ELD for maximum potential. This is our most accurate platform. Break into the world of AR-10 range and accuracy while staying in an AR-15 platform.