Upper Receiver Groups

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Frequently Asked Questions

An ejection port cover can be found on most mil-spec upper receivers to protect the bolt carrier group from dust and debris. Located on the righthand side of an AR-15, the ejection port removes the spent casing in the chamber by causing the bolt carrier group to slam rearward, allowing the extractor to fling the casing out of the receiver.

The forward assist is a mechanism that closes the rifle’s bolt carrier groups when activated, chambering a round. Found on the righthand side of most AR-15's, directly below the charging handle, the feature was added after American soldiers were experiencing jammed rifles overseas.

A muzzle device on an AR-15 attaches to the end of the barrel to deflect or redirect high-velocity gases and pressure to the rear, lower the effects of recoil, and allow you to maintain control of the weapon.