A lot of DI (Direct Impingement) AR-15 / M4 rifles are overgassed, and occasionally undergassed. If your rifle is over / undergassed, this can create problems. Both with respect to reliability, extra wear and tear on parts and possibly an unnecessarily strong recoil impulse.
In this video I will show you how to determine if your rifle is over or undergassed. And if it is overgassed, I will show you some simple parts you can swap out in order to get it running the way it should.