If you do further research the new Sig MPX has a short stroke piston system W/ (FIXED) gas valve, over this models auto-regulating

Question

If you do further research the new Sig MPX has a short stroke piston system W/    (FIXED)     gas valve, over this models auto-regulating

James G. · Answer

This is the case Branston. The newest model has a Short Stroke Piston system w/fixed gas valve..

William L. · Answer

your right it's the older model

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