Here are the specs. $600 ftf 9mm RRA upper 16" A2 with CAR handguards with A2 flashhider and bayo lug. The lower is a Stag arms with RRA 9mm trigger group and 9mm buffer. The stock is an ACE shorty entry stock. The mag block is a hytech that takes unmodified UZI mags. Includes two 25 rd IMI uzi mags. I'm tempted. What's the deal with the trigger group and buffer, though. Would I have to replace them if I got another upper? I don't really know shit about funky ARs.