Well, I haven't done this nor know of any one who has, but I figured I'd ask.....
Okay, how many of you have 'lost' the take down and pivot detents when assembling the lower? I've lost two on one lower....

Any how, after looking at the detents.... I was thinking. If one had an old U-joint around, couldn't the roller bearings from the joint work? I mean, take a bench grinder, needle nose pliers and grind one till it was just right. I haven't taken a caliper to the 'spare' detents and the needle bearings to see if they are the right diameter (yet). Just a (dumb?) trick I wanted to throw out to get an opinion....
So any one else have 'cheap' tricks they're willing to share (pertaining to AR's or firearms....)