NLA Sig MPX Ambidextrous Charge Handle The demand for a MPX Ambidextrous Charge handle was overwhelming. You asked, Next Level Armament listened. Based upon one of the industries best ambidextrous charge handle design that includes models for the AR15 rifle, the AR10, and M&P 15-22, we delivered a smooth and rigid charge handle. The MPX Ambi Charge was born. NOTE: Sig modified their block design with the new PPC, but the charge handle kept the same specifications. Although our MPX lifter block will work with the PPC, our block does not have the tab the new PPC block has, which results in a small void when installed. Our MPX Charge Handle will work with all MPX models. Therefore we are offering the handle as a stand-alone product.