Enables two extra rounds to be at the ready in front of the ejection port. It uses the same proprietary mounting method as the rails to withstand the recoil produced by our 12 gauge shotgun. The low profile mount minimizes snagging on gear. It’s constructed of the same grade aluminum used in the Kriger shotgun.Please note: This Forward Shell Holder only fits on the M127 Kriger shotgun. For the picatinny mounted 2 Round Forward Shell Holder, please visit out affiliate website Mark Precision Design.