308 AR Bolt Catch Screw | AR-10 Bolt Catch Pin
308AR AR-10 Bolt Catch Pin – The bolt catch pin, one of the smallest parts on the 308AR, AR-10 and AR-15 platform weapons is a part that can stop an AR-10 308AR build dead in it’s tracks if you didn’t purchase the correct one or the correct LOWER PARTS KIT for your STRIPPED LOWER RECEIVER. Here’s why. The AR-15 platform uses a roll pin and that’s taken for granted when shooters move up to the AR-10 and 308AR platforms. Unfortunately this is where the topic gets muddy.
The Armalite AR-10 utilizes a roll pin Armalite part number EL0220 which is the same as their M-15/AR15 rifles. while DPMS LR-308 based weapon utilize a proprietary hybrid pin/screw.
This screw is essentially set screw who’s threads have been removed from one end creating a hybrid screw type pin. Now unfortunately though not all DPMS LR-308 based LOWER RECEIVERS utilize the hybrid BOLT CATCH PIN. Some manufacturers utilize the roll pin method identical to the Armalite AR-10.
Now further complicating the mix at least one AR15 manufacturer has begun utilizing the hybrid screw rather than the milspec roll pin used universally on the platform for decades.