Retaining pin

Building a rifle based on the AR-15 hardware?

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Retaining pin

Postby shootermcmillan » Fri Oct 24, 2014 7:14 pm

Any benefit to this style of retainer? I need to order a pin as mine doesn't seat all the way and jammed me up today.
Pros/Cons???
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Re: Retaining pin

Postby Globemaster » Sat Oct 25, 2014 3:28 pm

KNS manufactures an aftermarket retaining pin like that, I've always wanted to try one of them
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Re: Retaining pin

Postby John A. » Sun Oct 26, 2014 6:11 am

Good evening Shooter. I've missed seeing you around.

I've wanted to try one of those, but have resisted the urge to try them.
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Re: Retaining pin

Postby HeavyG-WV » Tue Oct 28, 2014 1:16 pm

Are these bolt retainer pins? Take the place of the cotter pin?
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Re: Retaining pin

Postby Rattler » Tue Oct 28, 2014 2:06 pm

HeavyG-WV wrote:Are these bolt retainer pins? Take the place of the cotter pin?

Not bolt retainer pins - firing pin retainer pins. And yes, they do take the place of the cotter key.
They work OK, no appreciable benefit really. I have had some that, because of the tolerance stack of the pin head and the bolt carrier recess, did not sit flush or below the carrier - which means they didn't work. The smaller the product you are working on, the more a .001" difference in tolerance makes a difference in the performance of the parts, as that .001" becomes a larger and larger percentage of your parts full dimension. As an example, a .001" different in a carrier may be a .001% difference (seeing that the product is roughly 1" in diameter), but for the cotter key diameter that same .001" becomes 10% of the width of the part.

Good product otherwise.
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Re: Retaining pin

Postby shootermcmillan » Tue Oct 28, 2014 11:18 pm

Thanks for the replies gentlemen. Hi John, been a crazy year. I was without internet for a while and I've been crazy busy renovating my house. Thanks Rattler for the detail, I think I will give one a try
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