I am looking at buying a pistol lower w/ enhanced kit and a upper 11.5" LE w/ MOE handguards; my other rifles are piston rifles (M&P15P, RFB, Golani,...) and would like to replace the DI system with an Adams Arms carbine length gas piston system; would ST do the swap or would I have to ask my gunsmith to do it?

We do not take in customer parts. You would need to arrange this with your gunsmith.

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