upper and lower fitting issues
Here's what I have:
3 uppers, all the same model and from the same manufacturer
3 lowers, all the same model and from the same manufacturer (different maker from the uppers)
2 of the uppers fit properly with all 3 lowers.
1 upper won't fit properly with any of the 3 lowers. I can slide the pivot pin in fine, but the takedown pin won't slide in all the way unless it is forced (hammered in) and I don't want to have to do that. If I reverse the process, I can slide the takedown pin in first without issues, but now the pivot pin won't slide in with finger pressure only. This happens with that particular upper and all 3 lowers.
I sent the problematic upper back to the manufacturer with an RMA. Got an email back saying that they tried the upper with several other manufacturers lowers (except for a lower from the same company as the ones I have) and they all fit fine so they sent the upper back to me (awaiting delivery on my end).
What least destructive means can I resort to in order to get this upper to fit with any of my lowers?
Re: upper and lower fitting issues
Quote:
Originally Posted by
grnamin
Thank you. Mega lower with Vltor MUR-1A upper. You're right about better off starting tight and loose.
It will get easier as you shoot the gun and as the finish wears at the lugs. It will probably always be tight, but should get easier to break down. You could try to polish the inside of the lug with a fine abrasive like a scotch Brite pad or something similar if it's really driving you crazy.