I'm trying to put together a 20Practical AR that can utilize an upper with a non reciprocating side charging handle (like Gibbz or American Spirit). I would be open to getting a complete upper, or individual parts and the name of a good gunsmith to put it together. I'd appreciate any leads for the complete upper and/or who makes a good quality barrel in this size (probably prefer a 1:10 twist, 24" w/5/8 x24 threads in a medium contour). Thanks for any help.