Built an A3 LH upper with a DPMS 24" super-bull, cryo-accurized barrel and a LaRue trigger. It's more sub-MOA than I am. Definitely a "roof top"/over-watch rig than it is anything I'd want to lug around during uncivil actions.
I'm not getting any younger, and am really starting to appreciate light-weight rifles. I recently had a chance to shoot a 20" AR15 that looked fairly mil-spec (A2 handguards, fixed stock), but had a "skinny" 5.56 barrel, flat-top upper, and Cavalry Arms polymer lower - owner said it weighed 6 pounds even (without optics). I really liked it!
;^)