I posted this in the AR Discussion forum and only got one reply, so I figured I'd see what response I get in the Builders' forum.
I built my AR with a J&T 16" A2 kit on a DPMS lower. After accessorizing a bit I want to take it to another level. I want to replace my upper with a flat top.
My upper was full assembled and headspaced when I received it, so I don't have experience in assembly of the top end.
Any advice on getting a stripped upper and transferring the components from my old receiver?
I figure transferring the barrel to the new receiver is most likely going to be the most critical step. Any tips?
Any pitfalls to be aware of where I could royally screw things up?
Anything that should be done by a bona fide gunsmith?
Any tips on rear sights? I've seen uppers with rails at various heights.
My plan is to also install a piston kit, now that they have hit the market.
Any advice is appreciated.