Please stop with this cheap garbage.... Are you serious with this upper?!
This review critically examines the Bushmaster Carbon 15 polymer upper receiver, highlighting its significant structural integrity issues. The speaker demonstrates how the bolted-on metal Picatinny rail detaches from the polymer, posing a serious safety hazard. The video strongly advises against using polymer for AR-15 upper receivers due to excessive stress and potential for dangerous failure, recommending traditional aluminum construction instead.









