Rock River Arms AR1700V1: Rock River Arms LAR-15 R3 Competition Rifle - Rock River Arms has developed the R3, which is a 3 gun competition ready rifle out of the box. The Shooter need add only the optics of choice and this well built riffle will tune in hits at 3/4 MOA at 100 yards. The standard features on the R3 are an 18 inch fluted stainless steel barrel, directionally tuned ported muzzle brake, low profile gas block, two stage match trigger, Hogue rubber pistol grip, RRA NSP-2 carbine stock, and safety selector.