TacStar Stock Adapter for Mossberg 500/590/990 12GA

The TacStar stock adapter provides a means to mount AR-15 mil-spec telescoping stocks and standard AR-15 pistol grips to Mossberg 500-series shotguns. It is configured to match the factory receiver contours for a secure fit and retains proper drop for use with bead or ghost-ring sights. The adapter accepts standard AR-15 grips (without a beavertail, or those with a flexible rubber beavertail) and features QD sling attachment ports on both sides. The adapter does not include a buffer tube or stock.

Key Specifications

• Compatible with Mossberg 500, 590 and 990 series shotguns.
• Caliber compatibility listed as 12 gauge.
• Accepts AR-15 mil-spec telescoping stocks and standard AR-15 pistol grips.
• Includes QD sling attachment ports on both sides for sling mounting options.
• Overall listed dimensions are 2.05 x 4.80 x 8.30 inches.
• Listed height is 2.05 inches.
• Listed width is 4.80 inches.
• Listed length is 8.30 inches.
• Model designation shown as Stock Adapter.
• Does not include buffer tube or stock; those items must be sourced separately.

Engineered to integrate AR-15 ergonomics with Mossberg 500-series platforms, this adapter offers a straightforward solution for shooters who prefer adjustable stocks and AR-style grips. Its design keeps sighting geometry intact while providing the mounting interface needed for a wide range of aftermarket AR-15 stocks and grips.