Unless he orders one of the sets of non-rotating pins. Either the popular KNS pins or one of the knockoffs which I have found work as well at half the price.
Howdy from the Texas side of the borders. Also, don't worry about stupid questions, you have watched the media for the last year have you not? You can't top that!
Only twice? I measure six or seven times to be sure. What I see is that if you get an 80% lower that is the same width, or slightly smaller than the upper, it really doesn't become too much of a problem.
Howdy from the Texas side of the borders. Ditto on using the same brand upper and lower unless you are into 80% lowers and milling your own. I have found that it is fairly easy to do enough "adjusting" with the mill to make an 80% lower fit very tight with virtually any upper.
I am a civil engineer. I can't fix STUPID but I can fix what STUPID does. It says so on the mug that sits on my desk and on the tee shirt I occasionally wear.