The pitbull's unique design provides a dual coil spring assembly located in the extractor which allows for easy cartridge insertion and retention in every chamber of the revolvers cylinder.This patented system allows the shooter ease of ejecting spent cartridges for immediate reloading.Charter arms has taken the difficulty of rimless loading and ejection to the simplicity of the rimmed cartridge in the revolver industry.Frame Description: Stainless SteelAction: SA/DACaliber: 9mm LugerBarrel Length: 4.20"Capacity: 5Hammer Style: ExposedGrips: Black RubberSights: AdjustableFrame Size: LargeCylinder Finish: StainlessBarrel Finish: StainlessBarrel Length Range: 4" to 4.99"