Centurion E4/ETB Chrome Tapered Bolt

Inter-Store Transfer
If this item is out of stock at your local RifleGear but available at our other location, no problem. Just place your order and select In-Store Pickup as the shipping method. As long as the item is legal in your location, we will transfer the item for you. You will be notified by email once your item has arrived at the destination.

The Centurion E4/ETB bolt design offers increased reliability and lifetime guarantee against bolt breakage. The new bolt body profile creates a larger radius between the lugs to allow pressure to spread over a larger area, reducing stress points. The addition of dual ejectors helps rotate brass off the bolt face to ensure more reliable ejection when running suppressed or in over-gassed systems.

E4 bolts will require Centurion "T" marked barrel extensions or the Knights Armament E3 extension to accommodate the taper lug design. *WILL not fit standard lug barrel extensions.

E4 bolts use standard gas rings for logistical commonality and also use standard extractors with black inserts and either Colt OEM extractor springs or our upgraded 5 coil chrome silica stress relieved spring for ultimate reliability (EXT-SPRING) .

Lastly,  E4 bolts do not require a proprietary cam pin or firing pin as they are designed to support standard pins.  However, they are NOT compatible with KAC's proprietary E3 firing pins or cam pins.