The Perpetual Agony of the AR-9
This guide details how to troubleshoot reliability issues in AR-9 platforms, specifically focusing on magazine feed lip interference with the last round bolt hold open (LRBHO) lever. It involves comparing magazine dimensions using digital calipers to identify the cause of malfunctions, particularly when using ASC or C-Products magazines. The analysis helps determine if a different magazine brand or potential modification is needed for consistent performance.











