This is a CMC Triggers Gas Block known as the .750 Internal Bore, model 81611.
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
