The TacStar Shotgun Rail Mount with SideSaddle (brand part number 1081029) bolts to the receiver of a 12 gauge Mossberg 500 or 590 and combines a Picatinny-style rail with an integrated shotshell carrier in one unit. TacStar builds the SideSaddle to give a shooter both extra ammunition on the gun and a mounting point for a red dot or other accessory, without stacking separate parts on the receiver. Because it’s a direct receiver mount, installation doesn’t require any drilling or gunsmithing on the shotgun. At roughly 8.75 inches long and 0.53 lb, it adds meaningful onboard capacity without significantly changing the shotgun’s balance.

Key Specifications

• Chambered for 12 Gauge shotguns.
• Fits the Mossberg 500 and 590 shotgun models.
• Functions as a shotshell carrier (SideSaddle) for onboard extra ammunition.
• Includes an integrated Picatinny-style rail for mounting an optic or accessory.
• Installs as a receiver mount, attaching directly to the shotgun’s receiver.
• Measures approximately 8.75 inches in length.
• Weighs approximately 0.53 lb, adding minimal bulk to the receiver.

Frequently Asked Questions

What shotguns does this fit? The Mossberg 500 and 590 in 12 gauge.

Does it include a rail for an optic? Yes, the SideSaddle combines a shell carrier with a built-in rail section for mounting a red dot or other accessory.

Does installation require gunsmithing? No, it mounts directly to the receiver.

Buy the TacStar Shotgun Rail Mount with SideSaddle – Mossberg 500/590, 12 Gauge

Add onboard shells and an accessory rail to your Mossberg in one bolt-on unit. Order it from our TacStar lineup, part of our shotgun parts selection, at our Lubbock, Texas gun shop for fast, direct shipping.