Lyman Shotgun Rail Mount With Sidesaddle Fits 12 Gauge Mossberg 500/590 Black. 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 at the ready the low profile design SideSaddle incorporates TacStar's proprietary material for durability and secure shell retention. Fits Mossberg 500 and 590. Specifications for Tacstar Shotgun Rail Mount With Sidesaddle for 12 Gauge Mossberg 500/590: Manufacturer: TacStar Gun Model: Mossberg Model 500 Mossberg Model 590 Condition: New Features of Tacstar Shotgun Rail Mount With Sidesaddle for 12 Gauge Mossberg 500/590: Billet aluminum construction non-glare hard coat anodized Straddles both sides of receiver for high rigidity Raised picatinny rail on top retains use of standard bead sights Low profile six shell sidesaddle Fits Mossberg 500 and 590 Package Contents: Tacstar Shotgun Rail Mount With Sidesaddle for 12 Gauge Mossberg 500/590 The Tacstar Shotgun Rail Mount With Sidesaddle Fits 12 Gauge Mossberg 500/590 Black 1081029 is a quality addition to the Tacstar lineup. For more great deals on Gun Parts by Tacstar please browse our TacStar Gun Parts page. Lyman Shotgun Rail Mount With Sidesaddle Fits 12 Gauge Mossberg 500/590 Black