The patented Raptor provides improved ergonomics and functionality compared to the factory variants. Its ambidextrous design allows rapid palm "blading" or finger-thumb charging of the weapon, ensuring the motion is fluid and fast from either strong or support side. The included Support Arm, which replaces the factory spring plate/housing, biases the Raptor upward to minimize scratching or damage to the receiver often caused by the factory charging handle.These variants are compatible with all generations of semi-auto and full-auto SIG MPX firearms. The Support Arm is recommended but not required for Raptor installation, and is not compatible with factory SIG MPX charging handlesDesigned & manufactured in the USA. SIG MPX & SIG MCX are Trademarks of SIG SAUER Inc. registered in the United States & Other Countries