Brownells AR-15/AR-308 Bolt Catch Spring

The Brownells AR-15/AR-308 Bolt Catch Spring is a replacement spring designed to maintain proper function of the bolt catch assembly on AR-15 and AR-308 platform rifles. Compatible with standard AR-15 and M16 lower receivers, this spring ensures reliable bolt hold-open operation. An essential spare part for gunsmiths and DIY builders performing maintenance or assembling AR-pattern rifles.