Clean and lube it?
Check receiver extension for crude or drag?
Different BCGs with the uppers, or same BCG?
You say no gas issues - is this based on inspection or ejection patterns?
If you are using same BCG with both uppers, have you checked the carrier key for leakage, and done the gas ring test?
You said 'with both an H and H3 buffer' on the USGI mags, did it lok back on the other mags with the H buffer?
Have you put a new mag release in the lower, checked to see if it's intact (on upper edge)?
Bolt catch works free and easy, spring tension?
Generally, I'm thinking gas.
Last edited by 26 Inf; 11-21-18 at 21:31.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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