There could be a couple of different areas that might be the cause, or help remedy the situation. You state that this project was a second rifle, have you tried fitting the upper on your other lower, and tried this lower with your other upper? Looking at the above pic, it is hard to tell if it's the upper receiver or lower receiver that is slightly out off in its machining, or a combination of both which is creating a stacking issue. P.S, a chomp stick makes for a great punch to drive the rear take down pin over to the unlocked postioin, since it will blow up/shatter before you can do any harm the receiver. I bring this up, since you may be looking a gifted horse right in the mouth, and don't realize it isntead. Simply, use to be a time when the RRA uppers to lowers where a very tight fit (ended up just like you have now) and because of such ideal tight lock ups of the two, was the upper and lowers that I used to build NM rifles. Hence easy slip of the take down pin line to begin with/the rear take down pin sliding way to easy through the rear lug channel, means by the time you get a few shooting and cleanings, the upper to lower receiver fit is sloppy, and then you trying to figure out way to tighten them up again. I want to see if the problem is the channels are off front to back, or the problem is the upper receiver can not be lowered enough on the lower receiver isntead.Īs for the rear take down pin being tight to start with, it kind of what I want in a upper to lower fit to begin with, since a little lube and a few shootings and cleaning will allow the rear take down pin to mate with the channel, and still have a tight fit down the road. Lock the front take down pin in place, drop the upper down as far as you can get it, and give me a photo looking through the rear take down channel to the back take down lug channel of the upper receiver (as close as you can get them to align).
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