Monstrum Grimlock Shotgun Red Dot Mount – Universal Mounting System, RMR RMSc Footprint

Meet the Monstrum Grimlock Shotgun Red Dot Mount, designed with a Universal Mounting System that secures to most popular drilled and tapped shotgun receivers. A dedicated red dot base lets you mount your dot directly onto the receiver, enabling quick target engagement in a variety of field scenarios. The design emphasizes solid alignment, flexible pattern compatibility, and straightforward installation, so you can focus on the shot rather than the setup.

Key options include footprints for both RMR and RMSc red dots, offering flexibility when selecting a preferred optic. Before purchasing, review the compatibility chart to confirm your red dot footprint and shotgun model choice, ensuring a secure, repeatable fit. This mount is engineered to provide a stable platform under dynamic conditions, with a clean, unobtrusive profile on a variety of receivers.

Broad compatibility and footprint versatility

The Grimlock accepts multiple drill hole patterns, making it compatible with many popular shotgun platforms. This includes major models from Mossberg, Remington, Winchester, Stoeger, and others that use common receiver hole patterns. A wide compatibility map helps shooters pair this mount with their existing shotgun while preserving the equipment’s original geometry.

• Mossberg 500/590/835/930/Shockwave
• Remington 870 Express Tactical
• Winchester SXP Defender
• Weathered and classic 1300/M1/M2/M3/Super Black Eagle
• Stoeger M3000/M3500
• Weaver 93 drill hole pattern

In practice, this means a more repeatable red dot setup across various receivers. The base clamps securely to the receiver with a dedicated mounting surface for the dot, helping maintain zero during transit or rapid-fire sequences. The system’s footprint options also simplify choosing an optic that best fits your preferred shooting style.

Durable build and included hardware

Construction focuses on rigidity and durability, with a complete screw set included to fit a range of makes and models. The kit provides both #8-40 and #6-48 screws in multiple lengths, allowing installation into factory mounting holes without compromising the receiver’s integrity. Follow the recommended torque of 15 in-lbs to achieve a secure, repeatable mount without overtightening.

• Universal mounting system for drilled and tapped receivers
• Dedicated red dot base for direct, clean alignment
• Includes #8-40 and #6-48 screws in multiple lengths

With this setup, you can expect a straightforward installation process that respects the receiver’s original geometry and provides a robust platform for your red dot. The design emphasizes reliable alignment and repeatable performance in real-world conditions, whether at the range or in the field.

Warranty and support

Monstrum backs this product with a lifetime guarantee, reflecting confidence in build quality and long-term performance. This warranty signals the brand’s commitment to durability and customer satisfaction across the product’s lifespan.