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Smith and Wesson AR Piston System

Discussion in 'Rifle Discussion' started by Zhivago, May 4, 2009.

  1. Zhivago

    Zhivago Everett, WA Member

    Messages:
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    Is anyone familiar with the Smith and Wesson piston system found in the models:

    M&P15 PS
    M&P15 PSX

    I'm curious if this is a proprietary design or is it a copy of the POF/Bushmaster system or some other company? Anyone have more info or experience shooting them?