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2.3 lbs of bolt mass vs 115 grn 9x19mm from a 2.5" bbl

977 Views 5 Replies 6 Participants Last post by  Blowback9Guy, 
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Rather impressive - it runs:

The Overmass Project: World’s heaviest 9mm blowback action? (with videos)
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LTP1
He needs a chronograph and a calculator and most of his experiments wouldn't be a surprise to him.
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