The bolt catch releases the bolt to battery when pressed after the bolt is locked open either manually or when the rifle cycles through all the rounds in the inserted magazine. The Extended Bolt Catch makes releasing and locking your bolt back so much easier do to it's increased surface area. Don't hunt around the side of your rifle for your Bolt Catch, go with our Extended Bolt Catch and never miss a beat.This bolt catch is also a great component to have in the spare parts chest or to use as a replacement for damaged components. Always be prepared and have the right parts to ensure your rifle is running it's best.Features: Significantly improves speed & efficiency of reloads. Compatible with AR-15 & AR-10. 4X more surface area than a standard bolt catch.