A simple and effective tactical upgrade for 12 Gauge Mossberg 500 and 590 shotguns- no gunsmithing needed. Ultra-rigid, this innovative lightweight aluminum unit straddles both sides of the receiver and is crafted with a non-glare anodized finish. The top Picatinny rail can mount a variety of accessories, yet is designed to sit just high enough to allow continued use of the shotgun's bead sight. Keeping six shells in readiness, the low profile design SideSaddle incorporates TacStar's proprietary material for durability and secure shell retention. Order the Shotgun Rail Mount with Sidesaddle by TacStar today for convenient way to reload. Billet aluminum construction, non-glare hardcoat anodized Straddles both sides of receiver for high rigidity Raised Picatinny rail on top, retains use of standard bead sights Innovative new low profile 6 shell sidesaddle Proprietary materials combined to create an ultra-durable shell retention system