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I just received my Model 1 sales 10.5" .300 fireball AR barrel yesterday.Haven't shot it yet,but after reading the above posts,it seems to me that the reason that you guys are getting higher velocities with shorter tubes is because there is no extra barrel to slow the bullet down. I remember reading here somewhere that the .300 whisper only requires 7 or 8 inches of barrel to achieve subsonic velocities.
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