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So I have been thinking about a possible oddball round to do in an AR and I am interested in the 300 whisper. Does anyone have any good info on it. I know you can load it subsonic or supersonic. I have seen a switchblock type gas block for it. I would make my own brass out of 5.56. What do people use for bullets, I think they use different ones depending if they are going for subsonic or not. Anyways, experiences welcomed.
 
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