FX Impact power kits available for install at Southern Precision Air Weapons. Power adjustability with a turn of the power dial. Shoot pellets on minimum settings and crank up the dial for heavier slug use. Makes big power without over stressing the rifle. Can be installed to new rifle orders or customer can send their existing rifle in for install. All parts are made of the highest quality and proven. NOTE every rifle tunes out at different FPE/FPS. https://spaweapons.com/products/spaw-power-kit-for-fx-impact-mk2-impact-x