308 AR Bolt Catch Screw | AR-10 Bolt Catch Pin Comparison

by | Oct 4, 2015 | Compatibility, Lower Parts Kits, Parts, Tools | 0 comments

Picture of a Falkor Defense 308 AR Bolt Catch Screw Bolt Catch Pin

308 AR Bolt Catch Screw or Threaded Roll Pin

308 AR AR-10 Bolt Catch Pin – The bolt catch pin, one of the smallest parts on the AR 308, 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 308 AR platforms. Unfortunately this is where the topic gets muddy.

Picture of Armalite AR-10B Lower Parts Kit 10LRPK-T

Armalite AR-10B Lower Parts Kit 10LRPK-T

Armalite AR-10 rifles use a traditional roll pin setup in the AR-10 lower receiver so their Lower Parts Kits obviously include the pin. If you use an AR-10 LPK on your non Armalite 308 AR you will need to order the threaded “Bolt Catch Screw” seen elsewhere on this page. I typically keep the Armalite LPK’s on hand as well as a few of the bolt catch screws.

Picture of an Armalite AR-10 and AR-15 EL0220 Bolt Catch Roll Pin

Armalite AR-10 and AR-15 EL0220 Bolt Catch Roll Pin

The Armalite AR-10 utilizes this roll pin, Armalite part number EL0220 which is the same as their M-15/AR15 rifles. Alternatively DPMS LR-308 based weapon utilize a proprietary hybrid pin/screw (mentioned above).

Picture of a DPMS AR 308 Bolt Catch Screw

DPMS AR 308 Bolt Catch Screw

The DPMS 308 Bolt Catch 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 platform based LOWER RECEIVERS utilize the hybrid BOLT CATCH PIN. Some manufacturers utilize the roll pin method identical to the Armalite AR-10.

Picture of 308 AR, AR15 and  AR-10 Roll Pin Tools

308 AR, AR-15 and AR-10 Roll Pin Tools

The process of installing the Bolt Catch Pin is probably one of the most difficult tasks for the inexperienced to perform. Not done properly it’s easy to damage the finish of your lower or worse, break something. Fortunately a little grease, a roll of masking tape and some special roll pin punch make it easy.  Visit our AR-10, 308 AR Roll Pin Tools Page