SKU: 100045008
UPC: 785939517446
MPN: BOLTCATCHPIN
The Sons of Liberty Gun Works AR-15 Bolt Catch Roll Pin is a factory OEM replacement for the small but critical pin that holds the bolt catch in place on a Mil-Spec AR-15 lower receiver. If you've ever had a bolt catch work loose or you're building a lower from a stripped receiver, this is the pin that anchors the assembly to the receiver lug. It fits standard Mil-Spec AR-15 dimensions, so it drops into the same hole the factory pin came out of. For builders sorting through small parts, having a known-good replacement on hand keeps a project moving instead of stalling over a lost pin.
This is a roll pin (a slotted, spring-tension pin) rather than a solid pin, which means it grips the receiver bore under its own expansion force and resists backing out under recoil. It captures the bolt catch and works alongside the bolt catch plunger and spring to give you the spring-loaded hold-open function when a magazine runs dry. Installation runs through the receiver from the magazine well side, and the pin's chamfered ends help it start into the bore cleanly. Because it's built to Mil-Spec AR-15 tolerances, it pairs correctly with standard bolt catches and lower parts kits. We stock the matching AR-15 bolt catch if you need the full assembly rather than just the pin.
Reach for this pin when you're assembling a fresh lower, replacing a pin that's started to walk, or restocking the small-parts bin before a build session. A roll pin punch and a small bench block make the install straightforward and keep you from marring the receiver. It's an easy item to keep a spare or two of, since it's the kind of part that disappears at the worst moment. Browse the rest of our AR-15 rifle parts and small components to round out a build or top off your toolbox.
It secures the bolt catch to the receiver lug on a Mil-Spec AR-15 lower. The pin holds the bolt catch in position while the plunger and spring provide the hold-open function that locks the bolt back when a magazine is empty.
Yes. It's built to Mil-Spec AR-15 dimensions, so it fits standard lower receivers and pairs with standard bolt catches and lower parts kits. It installs into the same receiver bore the factory pin uses.
A roll pin punch sized for the bolt catch pin and a bench block to support the receiver. The pin's chamfered ends help it start into the bore cleanly. Work from the magazine well side and avoid marring the receiver finish.
It's a roll pin, meaning it's a slotted, spring-tension pin that grips the receiver bore under its own expansion. That tension helps it resist backing out under repeated recoil better than a slip-fit solid pin would.
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