I have BCM pistol lower I acquired secondhand a good while back that I had coated and rebuilt. It had an aftermarket trigger installed with KNS pins that I replaced with a BCM PNT trigger I had in another rifle. I can't get anymore than 2-3 shots off before the pins start drifting out and the gun won't fire. The trigger was fully functional in the other rifle and I have reinstalled the trigger several times to try and eliminate possible installation error with no improvement. Any recommendations on what to check into next or am I stuck using one of those crummy cartridge-style triggers with anti-walk pins?
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Drifting AR-15 trigger pins? Things to check?
- Thread starter Outlier
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You did use FCG pins with groves in them I hope. Guessing if you reused the KNS pins without the locks, there is nothing to keep in captured.
Make sure the hammer spring is installed correctly, if it's backwards, it won't hold the trigger pin..as long as the trigger pin is grooved.
It has been a while since I last shot it but I'm pretty sure it has just been the trigger pin that is drifting. And if I remember correctly it always drifts out towards the magazine release side, not the safety side.
Check and see that both the hammer spring legs are on top of the trigger pin. I'm sure that it is something simple; just have to figure out what it is. Might help to post a picture looking down into the receiver of the fire control group.
If it’s just the trigger pin, I’m with the fellas above. Check to make sure that the legs on the hammer spring are on top of the trigger pin, and under it. Feel free to post a pic.
If assembly is correct, and the pins are the correct type with 2 grooves, then you may need to replace the hammer spring.
If assembly is correct, and the pins are the correct type with 2 grooves, then you may need to replace the hammer spring.
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