The Forward Shell Holder is built to give the user the ability to carry two 12 gauge rounds on either the 3 or 9 o'clock positions with the rounds facing forward. The shell holder utilizes a low profile clamp to minimize encroachment into the forearm. The 3 piece construction features a recoil lug to keep the forward shell holder in place under the heavy impulse produced by high power loads. The 2 round shell carrier has a recoil stop mechanism to instead of relying on a fastener to hold the device in place. This stops forward movement under recoil and prevents damage to the rails. However, the Forward Shell Holder works best with semi-auto shotguns rather than pump shotguns. The 2 Round Forward Shell Holder will fit ANY mil spec M1913 rail, but we cannot guarantee fit on a Weaver rail. The shell holders are finished with a Type III hard anodize.