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Mil-Spec Replaces Standard Cotter Pin In The Bolt Carrier Specifications for Guntec USA AR-15 Firing Pin Retainer: Manufacturer: Guntec USA Gun Model: AR-15 Condition: New Package Contents: Guntec USA AR-15 Firing Pin Retainer
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Preacher –
Great idea – works okay. The problem with this versus a standard retainer is that it is easily too wide, or so narrow that it can fall out. I took my rifle out today and fired roughly 1500 rounds, and when I took my bolt out for cleaning, it literally fell out. I am not sure if it broke or something else, but when I place it in originally, it retained perfectly. I am going to play with it some more tomorrow and see what could have happened. I have a regular spare that I will be using in the mean time and I am not sure if these are actually worth buying over a traditional retainer.
zijiehe –
I thought the pin should be much stronger than the common pins, but it's 4x more expensive and cannot hold in place as it should be. I removed the bcg today for cleaning up after several hundreds rounds, it just fell off.
Don –
I use these in all my AR's now. Fits somewhat loose but that's the point, and it can't fall out while the carrier is installed. Mine never fall out on their own, and I need to bang the carrier against my hand to get it to extend so I can grab it.Big improvement over the old split pin. I no longer need to spend 15 minutes all pissed off trying to get those 2 split ends into the hole. Lol, thank God!�
RacerRick –
When I discovered that Stoner himself designed the BCG with this little gem, I dug in to find out why they switched to a cotter pin. Simple answer; easy to replace when lost. Makes sense…in the field. But for the rest of us civilians, this is by far the better play. Never again will you gave to squeeze a splayed cotter pen into that tiny hole on the other side…and you know what I mean :-/