CNC Machined 6061 T6 Aluminum Military Type III Anodized Integrated Top Rail Military Type III Anodizing 9 Shell customizable configuration Military grade reinforced synthetic material Shell holders mount in any location on the side saddle Mount as many or as few shell holders as desired Sleek Skeletonized Side Saddle Design Limited Lifetime Warranty DIRECT FITS: Mossberg 500/590 12GA with Tapped Reciever FITS WITH MODIFICATIONS Maverick 88 Remington 870 Winchester SXP NOTE: Do NOT over tighten screws. Stripped holes and broken screw heads are NOT covered under the warrenty. Mfg: Advanced Technology