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Anyone who has fought with a factory cotter pin during a BCG reassembly knows the frustration of a split pin that won't line up or bends out of shape. The KNS Precision Perma Firing Pin Retainer solves that headache by replacing that fiddly wire cotter pin with a single solid pin, machined from high strength tool steel. It's a nod to the way Eugene Stoner originally designed the rifle, and it slips into standard AR-15 and M16 bolt carriers with no modification to the gun required.
The job here is simple but important: keep the firing pin secured inside the carrier so your rifle runs the way it should. Because it's a machined pin instead of a bendable wire, it holds up to repeated takedowns without wearing out or getting lost the way cotter pins tend to. Folks who run multiple ARs often grab one for each bolt carrier so they never have to hunt for a stray cotter pin again.
Straight talk on the install: the first time you seat this pin, take your time and follow the KNS instructions. It's a snug fit by design, and working it in slowly is the way to go. Once it's seated, you'll appreciate how fast disassembly and reassembly become. A punch or the tip of a cartridge makes pulling it back out easy when it's cleaning day.
This pin is built for standard mil-spec AR-15 and M16 bolt carrier groups in calibers like 5.56 and .300 Blackout. It does not fit .308 or 7.62 bolt carriers, so keep that in mind if you're working on a larger frame build. The black finish keeps things low profile and helps resist wear during normal use. KNS Precision machines these in Fredericksburg, Texas.
It's designed to drop into standard mil-spec AR-15 and M16 bolt carrier groups, which covers most common builds in calibers like 5.56 and .300 Blackout. It replaces the factory cotter pin with no modification to the gun. It does not fit .308 or 7.62 bolt carriers, so it's strictly an AR-15 platform part.
The first install takes a little patience since it seats snugly by design. Follow the KNS instructions and work it in slowly rather than forcing it, and it goes in fine. After that, disassembly and reassembly are noticeably quicker than fighting with a wire cotter pin.
A punch or the tip of a cartridge is all you need to press it back out when you're breaking down the bolt carrier. There are no special tools required for the job. Once you've done it a couple of times it becomes routine.
It's machined from high strength tool steel and finished in black. That solid construction is what lets it hold up to repeated takedowns without wearing out or bending like a standard cotter pin. It's also made in the USA by KNS Precision in Texas.
| UPC | 851876003011 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | PERMA |
| Color | Black |
| Length | 4.9500 |
| Product Type | Bolt Carrier Group Part |
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