No Gunsmithing Required; Increases Mag Tube Capacity
All-steel extension tubes attach directly to the end of the magazine tube and increase capacity by as much as five rounds. Extension cap is machined from solid steel and welded to seamless steel tubing for extra strength. Includes extended magazine spring. Only the 5 round extensions come with a barrel magazine clamp. The barrel clamps are available separately for the other models.
Big Book Catalog, Issue:66, Page:197
Law Enforcement / Police Store, Issue:08, Page:029
New Product Supplement, Issue:602, Page:030
SPECS: Steel, blue, matte finish. 12 ga. only. Rounds (RDS) indicates number of rounds extension adds to factory magazine capacity model.