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Complete Upper

MDX Arms specializes in custom build uppers from the ever popular .223/5.56, 300Blackout or 9mm/Pcc to large bore like .308, 6.5 Creedmore and all new 247 Valkyrie. We can also build purpose specific uppers most notably 3gun competition builds, PCC USPSA build or just your SHTF build. If you can't find the upper you're looking for on our store, please contact us at 951-223-8086 or tell us your dream build and we will do our best to make it happen.