Here is what I'd do:
Make sure everything is sealed up correctly - gas block, gas tube, carrier key. Remember - it isn't completely abnormal for there to be some soot around the gas tube/gas block juncture.
I generally test fire a new build in stock configuration. In this case, a carbine buffer and regular carbine spring. That way I'm not chasing stuff.
So I'd try with a carbine buffer, carbine spring first; if that works then I'd try an try an H with the regular carbine spring (or the H2 if you don't have an H). If that works then I'd diddle with the blue spring.
JM .02 - probably overvalued.
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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