TRINITY Scope Base Rail for Mossberg 590A1 12 Gauge Aluminum Mount 5.5in - Black

Expand your optical mounting options with the TRINITY Scope Base Rail for Mossberg 590A1 12 Gauge, a lightweight aluminum receiver mount designed for compatible Mossberg models with factory pre-drilled mounting holes.

Featuring a 5.5-inch Weaver-style and 1913-pattern accessory rail, this mounting base provides a secure platform for compatible optical scopes, red dot sights, reflex sights, and magnifiers.

The low-profile design incorporates a see-through center channel, intended to preserve visibility of the factory front bead sight when the rail is installed without an obstructing accessory.

Manufactured from durable aluminum with a black anodized finish, the TRINITY receiver rail combines rigid construction with a lightweight design weighing approximately 1.4 ounces.

The rail attaches directly to compatible factory mounting holes using the included screws, eliminating the need for additional receiver drilling on properly prepared models.

Designed for compatible Mossberg 500, 590, 590A1, 590 Shockwave, 835, 505, 510, 535, 930, and 935 configurations, this versatile mounting base provides a practical optical attachment solution for hunting, range activities, and outdoor sporting applications.

Important: The receiver must have compatible factory mounting holes. Older Mossberg configurations may require different mounting screws.

Designed for Mossberg 590A1 12 Gauge

The TRINITY aluminum scope base is designed for compatible Mossberg 590A1 12 Gauge receivers with factory pre-drilled mounting holes.

Its low-profile construction provides an accessory mounting platform along the upper receiver surface.

Primary Features:

• Designed for compatible Mossberg 590A1 12 Gauge configurations

• 5.5-inch accessory rail

• Low-profile receiver mounting

• See-through center channel

• Lightweight aluminum construction

• Black anodized finish

• Mounting screws included

The rail provides a convenient attachment point for compatible optical accessories without requiring permanent modifications to properly prepared receivers.

Additional Mossberg Model Compatibility

According to the supplied product specifications, this rail is also intended for compatible configurations within the following Mossberg product families:

• Mossberg 500

• Mossberg 590

• Mossberg 590A1

• Mossberg 590 Shockwave

• Mossberg 835

• Mossberg 505

• Mossberg 510

• Mossberg 535

• Mossberg 930

• Mossberg 935

Compatibility Requirement: The receiver must have the correct factory mounting-hole pattern and compatible screw threads.

Model-family compatibility does not guarantee fit across every production year or receiver variation.

5.5-Inch Weaver-Style Accessory Rail

The TRINITY scope base features a 5.5-inch rail intended for compatible Weaver-style and 1913-pattern optical mounting accessories.

The rail provides a mounting interface for several types of sporting optics.

Compatible Accessory Categories:

• Optical scopes

• Red dot sights

• Reflex sights

• Compatible magnifiers

• Other suitable rail-mounted optical accessories

Accessory compatibility depends on the mounting interface, available rail space, and equipment clearance.

Low-Profile See-Through Channel

The TRINITY rail features a see-through center channel designed to help preserve visibility of the factory front bead sight.

This low-profile design allows the rail to sit close to the receiver while providing an elevated mounting surface for compatible optics.

Design Benefits:

• Low-profile receiver placement

• Integrated see-through channel

• Compact aluminum construction

• Optical mounting flexibility

• Streamlined appearance

Note: Actual front bead visibility depends on the receiver configuration and installed accessories.

Durable Aluminum Construction

Manufactured from solid aluminum, the TRINITY scope base provides a rigid mounting platform for compatible optical accessories.

The black anodized finish helps protect the aluminum surface against everyday handling wear.

Construction Features:

• All-aluminum construction

• Black anodized finish

• Lightweight 1.4 oz design

• Rigid receiver mounting base

• Low-profile housing

• Compact 5.5-inch length

The aluminum construction provides a practical balance of strength and weight.

Factory Mounting-Hole Installation

The TRINITY receiver rail is designed to attach directly to compatible factory pre-drilled mounting holes.

Installation Features:

• Direct receiver mounting

• Uses compatible factory mounting holes

• Mounting screws included

• No additional drilling required on properly prepared receivers

• Low-profile installation

Verify the mounting-hole pattern and screw thread specifications before installation.

Important Information for Older Mossberg Models

Some pre-1997 Mossberg receivers may have different factory mounting-hole thread sizes.

According to the supplied product information, certain older configurations may require 6-48 TPI mounting screws instead of the supplied hardware.

Do not force incompatible screws into the receiver.

Confirm the correct thread size and screw length before installation.

Compact and Lightweight Design

The TRINITY aluminum scope base provides a mounting platform without unnecessary bulk.

Dimensions:

• Length: 5.5 inches

• Width: 0.75 inches

• Height: 0.3 inches

• Weight: 1.4 oz

Its compact profile makes it suitable for compatible Mossberg receivers with limited mounting height.

Black Anodized Finish

The black anodized aluminum finish provides a clean appearance that complements compatible Mossberg equipment.

Anodizing helps improve resistance to everyday surface wear while maintaining a consistent matte-style black appearance.

Suitable for Hunting and Range Applications

The TRINITY scope base provides a convenient mounting solution for compatible optics used during hunting, target shooting, and range activities.

Its lightweight aluminum construction, low-profile design, and included mounting hardware make it a practical accessory for compatible Mossberg configurations.

Key Features and Benefits

• Mossberg 590A1 Compatibility – Designed for compatible Mossberg 590A1 12 Gauge receivers.

• Additional Mossberg Compatibility – Intended for compatible 500, 590, 835, 505, 510, 535, 930, 935, and 590 Shockwave configurations.

• 5.5-Inch Accessory Rail – Provides mounting space for compatible optics.

• Weaver-Style Interface – Supports compatible Weaver-style mounting accessories.

• 1913-Pattern Compatibility – Designed for compatible 1913-pattern optical mounts.

• Low-Profile Design – Positions the rail close to the receiver.

• See-Through Center Channel – Intended to preserve front bead sight visibility.

• All-Aluminum Construction – Durable metal mounting platform.

• Black Anodized Finish – Helps resist everyday surface wear.

• Lightweight 1.4 oz Design – Adds minimal weight.

• Scope Mounting Compatibility – Supports compatible optical scopes.

• Red Dot Compatibility – Provides an interface for suitable red dot sights.

• Reflex Sight Compatibility – Supports compatible reflex optics.

• Magnifier Compatibility – Accommodates suitable optical magnifiers.

• Factory-Hole Installation – Designed for compatible pre-drilled receivers.

• Mounting Screws Included – Supplied hardware for compatible installations.

• No Additional Drilling – Required only when compatible factory holes are present.

• Compact 0.3-Inch Height – Maintains a low-profile configuration.

• Hunting and Range Applications – Versatile optical mounting solution.

Technical Specifications

Package Includes

• 1 × TRINITY 5.5-Inch Aluminum Receiver Scope Base Rail

• Mounting Screws for Compatible Factory Receiver Holes

Note: Optical scopes, red dot sights, reflex sights, magnifiers, and other accessories are not included.

Important Compatibility Information

Before purchasing, verify that your Mossberg receiver has:

• Factory pre-drilled upper mounting holes

• A compatible mounting-hole pattern

• Correct screw thread dimensions

• Adequate clearance for the rail and intended optic

Older Mossberg Models: Some pre-1997 receivers may require different mounting screws. Verify the correct thread specifications before installation.