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Shane,
Did you run the H3 from the start? And is that a standard buffer spring?
Travis,
Initially I was using a rifle stock/buffer system. That worked well.
Then I went to a standard 3.0 oz carbine buffer in the M4 style buttstock. That worked well too, but I could feel the buffer hitting the back of the extension tube with a solid thump.
Then I ordered some tungsten weights and made the standard buffer into a 5.4 oz H3 buffer. This works great too, and the buffer isn't pounding the back of the extension tube. It feels very smooth.
