Brn-180 16'''' Build Kit .223 Wylde

Designed in conjunction with PWS & FM Products, the Brownells BRN-180™ Complete Upper Receiver is inspired by the Armalite® AR-180 of the 1960s. Developed as a successor to the original AR-15, the AR-180 was a civilianized version of the AR-18, itself an upgrade on the M16 platform. The BRN-180™ incorporates many of the AR-18/AR-180 improvements - including its robust and reliable gas piston operating system. (Yes, the originators of the AR-15 / M16 eventually embraced a piston!)   The BRN-180™ Gen2 Upper Receiver Group improves upon the original BRN-180 with two main upgrades.  First, all BRN-180™ Upper Receivers now ship with an Adjustable G Mfg: Brownells