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 223 Wylde version comes with a 10.5" barrel configuration. The free float M-LOK handguard mated to the assembly is also shorter, terminating just in front the gas block. This resulting shorter system also required Mfg: Brownells
