How to Build an AR Upper: Instructions & Photos
Ready to assemble a barreled AR-15 upper receiver? Follow these instructions. We’re assembling a 300 Blackout upper, but these instructions are identical for all standard AR-15 (5.56/.223), AR-10 (.308) and AR9 (9mm) uppers. Note that 9mm uppers do not need a gas system, so skip those steps. Total time required is approximately 30 minutes to…
