i'd go w/ BUSHMASTER
get an A3 and izzy/vortex/phantom fh and 16in chrome bbl,and m-4 handguards
if you want mil-spec
h/w if you build your own, you can put whatever you want on it--change butstock(ace, vltor, magpul, car, m-4, a2, etc), grips (ergo, samco, a2, houge, etc), handguards( quad rails-KAC, yhm, m-4, etc) ,trigger (jewel, std, etc, sights (buis, flips, a2, etc) to whatever you want, not just stock production
for a scope, i'd go w/ a ACOG