Home Forums Hunting & Shooting AR and Tactical Rifles Fix for Under-gassed Rifle?

I would not make any permanent changes to gas port until you are sure you understand the issue. If the system is truly undergassed, I would do the following:

1. First, is the gas block self indexing, or fixed in position by cross-pin? If not, check alignment.
2. Have you removed all carbon from the existing gas port?
3. Any gas escaping around gas tube?
4. How many rounds on gas tube? Is tube kinked or fouled?
5. Do you have a standard weight Buffer and spring?
6. Are you running a muzzle device. Depending on type, this can increase gas pressure.
7. Make sure components (BCG, bolt, Mag, etc.) are not dragging.

If you are sure that you are maximizing existing gasses, then consider a lighterweight BCG, and other fixes.