Extra Parts!!?? No such thing. They are parts waiting to become rifles.
I had a M16A1 grip sitting around my shop a while back. I had picked it up years ago from a Gunsmith that was cleaning out his shop. I got to thinking about used and junk parts. So I started a post about wanting to do a Junkyard build. I got a lot of help from members here on the forum and another with collecting used and unwanted parts.
The buffer tube came from my junk box. I had to use a break cylinder hone to clean up the inside of the tube so that the buffer would not get stuck.
The only new parts on the rifle are the lower, buffer, buffer spring, detentes and detente springs.
The rifle turned out very nice and is a great shooter, and is one of my favorite guns to shoot.
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I have enough parts sitting around my shop to build six or seven AR's, with many parts to spare.
I have also sent some parts to other members to help them with their builds. There is no cure for the AR Bug so, all we can do is help to infect others.