These Retro uppers from H&R are an early 604ish style upper that utilizes a few transition parts including a "Non Serration" Chrome, Full Auto, Bolt Carrier Group, a Triangle A1 style Charging handle, and the iconic 3 prong flash hider. The upper receiver is Type 3 Hard Coat Anodized black for easier match-up with your black H&R Lowers. It features our 1/7 twist 20" pencil profile barrel and uppers forged from proprietary Nodak Spud Dies. These complete uppers are hand fitted and assembled right here in the United States of America.