Unique" all-steel gas blocks expand the versatility of your rifle by providing a variety of accessory rail and hand guard mounting options. Especially helpful in customizing short-barreled tactical rifles. Designed Specifically for AR15's with a barrel .750" O.D. at gas port.

Features:
Machined from 17-4PH Stainless Steel
Nitride Finish
Low Profile
.750" O.D. at Gas Port