This AR-15 Bolt Catch Kit has the four parts you need to install or replace the bolt catch on a lower receiver. The bolt catch locks the carrier to the rear on an empty magazine, and it lets you lock the bolt back by hand for inspection or to clear the rifle.
Use it to finish a lower build, or to replace a worn catch, a lost spring or a damaged roll pin on a rifle you already own. The kit includes the bolt catch (also called the bolt stop) along with the roll pin, spring and plunger (detent) that hold it in place and give it tension.
What's included:
Fit check: the kit installs on a mil-spec AR-15 lower receiver. Confirm all four components are present before you start.
Install tips: support the bolt catch ears on the receiver while you drive the roll pin so you don't crack or bend them; a bolt catch block or tape on the receiver helps. Use a roll pin starter punch. After installation, insert an empty magazine and run the charging handle to confirm the bolt locks back, then confirm it releases when you press the catch.
