FA = Forward Assist?
FA = Full Auto? o.O
Range and SD/HD are kinda dissimilar.
For a Self Defence/Home Defence SHTF gun I want a lightweight gun that handles well, turns fast. I'd get a lightweight gun, with a sling and torch, with a red dot, and a lighweight pencil profile barrel. For indoor use, the shorter the better.
For a range gun only I'd probably prefer a heavier barrel or at least a mid contour type barrel. You can probably forgo back up iron sights, and just put an optic (red dot, holo, scope etc) and have some fun. Probably look into free floating handguards if going over 400 yards often. Maybe consider a 18 + inch for shooting longer ranges, and 1x8 or 1x7 ttwist for longer bullets.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul