Brownells Brn-180s~ 300blk Upper With Vortex Sparc Solar Red Dot

BRN-180S Gen2 Now with 300 Blackout Configuration! Designed in conjunction with PWS & FM Products, the Brownells BRN-180S Complete Upper Receiver is the newest iteration of the BRN-180 Upper Receiver, which was inspired by the Armalite AR-180 of the 1960s. The BRN-180S shares a large chunk of components with the BRN-180, but introduces key features to improve reliability and usability in a short configuration. The BRN-180S is obviously shorter than the standard BRN-180. The 300 Blackout required a shorter system to ensure reliability with a wide variety of supersonic and subsonic ammunition. This resulting shorter system also required a Mfg: Brownells