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We need to know where your gas port is and what size it has been drilled to. We also need to know what your barrel length is. 1680 and similar are good for carbine length gas systems (16" barrels), and the 2400 burn rate powders are good for subsonic with large gas port holes in the pistol position. Just need a little more load info to help you out.
Kevin
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Can you hear that? It's our founding fathers turning over in their graves...
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