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I picked up 9 of these. What I found is that a pistol grips works much better. More natural to push forward on it rather than a normal grip. 300 rounds is a bit much isn't it? Your at the point of damaging your barrel I think. 100 rounds with the bump stock makes the barrel smoking hot. After 300 the barrel is so hot when you chamber a round it right away expands from the heated barrel so much it could jam. I was told by a dealer that this company is developing these stocks for ak47's.
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