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I received a name-brand upper (I’m reaching out to the upper manufacturer to see if they have any thoughts as well) and went to put it on an existing lower I have, but the takedown pin won’t fully insert.
The takedown pin will encounter severe resistance once it gets about 3/4 of the way to being fully seated. If I wish to get it in all the way I have to pound it in with a rubber hammer. Taking it out is equally difficult. The pivot pin has no issues.
The lower in question has had two different uppers on it without encountering this issue and was sitting in the safe alone, hence the new upper.
The new upper fits perfectly fine on the four other lowers I’ve tried it on (each has an upper associated with it already which were tested with the problem lower).
The old lower fits 2 of 4 uppers fine, a third is a bit of a tight fit, but no real problems, and the fourth goes about 4/5 of the way before extreme force is required to finish the job.
I initially thought the takedown pin might be on the large side so I tried sanding it, but that didn’t really help. I pulled the takedown pin from the lower and it drops right into the retaining hole in the upper without any resistance. A new takedown pin similarly drops right into the upper.
Looking through the takedown pin hole with the receivers together there is a bit of a high spot in the lower when compared to the upper.
Seeing as how this new upper fits other uppers with now trouble and the manufacturer clearly test fired it (brass marks on the deflector) I don’t think it it the problem.
Does anyone have any suggestions for a home-fix for this?
Thanks for any suggestions
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