A3 - Delton upper Wilson 1:9 non-chromelined barrel. approx 800 rds through it. Never had a problem of any kind with this upper. Receiver 99%, rifling 100%, barrel outside %85-90%. $190 alone
A1 - I know little about this upper. I never got around to buying a preban lower. It has been sitting here since I bought it used. Manuf marks filed off of upper by previous owner. Rifling looks good, barrel finish is good. non-chrome lined lightweight profile barrel. Gas tube was in bad shape so I put a new one on it. $150 alone.