Magazine sleeve slides down over the top of the magazine and fills the gap between the bottom of the grip frame and the base of the magazine.This mid-sized sleeve for backstrap 2 is for your springfield xd-s with a 3.3-4 barrel chambered in 9mm. Caliber: 9mm Luger Finish: Black Model: XD-S Material: Polymer Type: Magazine Sleeve Model Fit: XD-S Brand Fit: Springfield Capacity: 0