Selling a Rock River Arms 9mm Upper Receiver. Barrel is Chrome Lined 16' with midlength HG and FSB. Does not include BCG / CH / Mag Block. Comes with a 32 rd Promag magazine. Has ran great with my RRA set up SBR paperwork in so getting pistol upper. This barrel has about 330 rds on it. Looking for $350 shipped. Please email any questions.