The SI pistol grip has a milder angle of about 15 degrees which clearly increases comfort when shooting from non-prone positions. The part is made of textured polymer in the front and back. In addition, a lowered spur has been added to position the palm slightly lower to reduce the distance of the finger from the trigger, which no longer has to be at an uncomfortable angle.

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The inside of the grip has been designed as a storage compartment closed with a rubber cover. Installation is done with one Allen screw included in the set together with a wrench and thread retainer. The price is just 20 USD.

The second accessory developed by the high-performance design team, as they release something on average rate of 3 weeks per design, is a double-sided safety/selector switch. It was shortened because the factory variant could be troublesome for shooters with smaller hands is it could cut into their hands. The kit includes three parts - two switches and one end cap with the setting indicator.

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The user can decide for himself if he wants his Scorpion to be fully right or left handed. Take note that the Scorpion EVO3 S1 charging handle can be moved to either side and the magazine release is double-sided. Everything you need for installation is included in the set and the cost is 14 USD.