Thread: S&W M&P AR in .300 Whisper (factory rifle)
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Old 11-06-2011, 12:10 AM
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Spook Spook is offline
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Quote:
Originally Posted by rsilvers View Post
A Whisper(R) chamber would be smaller than a Blackout chamber, so in order to be both, it has to be a Blackout chamber.
How do you know that to be the case?
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