Greetings All,
Longtime lurker and I did attempt several searches with no related posts found.
I bought a 10 year old patrol rifle from my dept.
bone stock Colt A2 Govt Carbine pencil barrel 16" with a sporter bolt (thats how they came in 2003) small .155 pins.
Trigger press is standard Colt (nothing fancy...duty trigger with long creep)
If I had to guess, around 10,000+ rounds fired through this gun but countless dry fires added. (the dept would buy alot of steel case Wolf back then). never a single issue with this rifle.
The rifle function checks properly but I noticed the hammer pin moves slight forward. The hammer pin holes have a very slight egg shape.
Years ago I purchased some KNS anti rotate pins (FAD) but never installed (still NIB)
I decided to install them on this Colt to minimize any additional wear on the hammer pin holes.
After install, the BCG locked up 3/4s back and would not go forward into battery. I pulled back on the charging handle to release any pressure and pressed the trigger. Felt a clunk and the BCG went into battery when I released the CH.
I pressed the trigger and the hammer fell but I saw the KNS outer arms move slightly forward.
I reset the trigger (while still holding the trigger to the rear) and as soon as I started to release the trigger, the hammer fell and the KNS outer arm moved fwd.
I reinstalled the factory trigger pins and the function returned.
This rifle was bought as a gift for my child to learn to shoot a standard AR platform.
If my lower receiver hammer pin holes are likely the culprit, is there a quality business that will bushing the pin holes or perhaps drill to the larger Colt hammer pin (.170)?
any other advice or direction would be greatly appreciated.
thanks in advance


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