**Centurion Arms E4/ETB tapered bolts may only be used in Centurion Arms' T-Marked barrel extensions or Knights Armament E3 barrel extensions. You are solely responsible for checking your Centurion barrel for the "T" marked extension prior to use with E4/ETB bolts (see photo below). We will not take a returns on misused E4 bolts due to your negligence in confirming your barrel is compatible.
Includes:
--Centurion Arms Hard Chrome Sandcutter Carrier - Phosphate Gas Key secured w/ OCKS
--Centurion Arms Phosphate Cam Pin
--Firing Pin
--Retaining Pin
--Centurion Arms E4 Tapered Phosphate Bolt*
*E4 Bolts will require our “T” marked barrel extensions or the Knights Armament E3 extensions to accommodate the taper lug design. See image below as well as current list of compatible Centurion Arms Barrels.
Currently E4 Compatible T-Marked Centurion Arms Barrels**:
**Previously purchased barrels from earlier batches will NOT have taper lug extensions. You must check your barrel prior to use with E4/ETB bolts.
All parts manufactuered and assembled in the USA!
