The SECRET to Making Your AR Run on Glock Mags Revealed
This guide details the process of converting a standard AR-15 lower receiver to accept Glock magazines using the Sylvan Arms 9mm Mag Block. It covers installation, magazine compatibility, and crucial troubleshooting steps, particularly regarding trigger group compatibility which can cause significant malfunctions. The expert instructor highlights the trade-offs, including the lack of Last Round Bolt Hold Open (LRBHO) on some systems and the benefits of cheaper ammunition for training.













