What The Heck Is An AR18? BRN-180 Upper For AR-15 Lowers
This guide details the installation and operational principles of the Brownells BRN-180 upper receiver for AR-15 platforms. It highlights the unique short-stroke gas piston system and dual internal recoil springs that eliminate the need for a buffer tube, enabling folding stock compatibility. The information is presented with high authority from ARFCOM News, offering a deep dive into the AR-180's lineage and modern adaptation.












