Brownells AR-15/M16 Magazine Feed Lip Gauge

The Brownells AR-15/M16 Magazine Feed Lip Gauge is a precision gunsmithing tool designed to measure and verify the feed lip dimensions of AR-15 and M16 magazines. Proper feed lip geometry is critical for reliable feeding and function — this gauge allows gunsmiths and shooters to quickly check whether a magazine's lips are within spec or have spread out of tolerance, helping diagnose feeding malfunctions and ensure consistent performance.