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| October 17, 2018

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ProWin;Hopup;Hop Unit; Archives -

Review: ProWin M4/AR15 Hop Unit

January 19, 2014 |

There are many hop units for M4 users to choose from. They range from outlandishly expensive (prometheus strike chamber) to questionably cheap (some of the cheaper ACM brands).

Most of them use the standard three gears design. At the time … Read More