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Smith and Wesson AR Piston System

Zhivago

Zhivago

Everett, WA
Messages
115
Reactions
4
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?
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