omegared24
Ultimate Member
Excessive use is probably the cause but it is a surplus (used) upper. I pinned them to a quality lower and it’s a sloppy fit. But I couldn’t find my feeler gauge kit before I had to go furniture shopping with the spousal unit to check the actual clearance between the receivers. I wouldn’t say it’s a major concern but I have the gauges to check it and this is what I found. The pivot pin (front lug) is good though. And these are those funky FN CAGE coded uppers with a raised “C” that’s supposed to be a Colt mark and they have an Anchory Harvey forge mark as well. If you ordered one, your results may vary. Just throwing out there what I found with mine so far.
I haven't done a test fit yet but I'll bet it is loose. I will most likely run it on a cerakoted lower that is super tight so it will probably fit just right. I'll let everyone know.