Grayboe Universal Mini Chassis For Howa 1500 Short Action Black

The Grayboe Universal Mini Chassis for Howa 1500 Short Action is a precision aluminum bedding block that transforms how you shoot multiple rifles and calibers from a single stock. Built from T6 6061 billet aluminum and finished in durable Cerakote black, this quick-changeout system lets you bolt different rifles into the same Flagstaff Core or Renegade 2 Grayboe stock without permanent modification. If you run a Howa 1500 short action and want the flexibility to swap rifles or experiment with different cartridges without buying separate stocks, the UMC delivers genuine versatility at the foundation of your rifle platform.

The system anchors securely with just two provided screws—lock your rifle and UMC into your Grayboe stock and you're ready to shoot. Magazine compatibility is straightforward: the chassis accepts standard AICS magazines directly into its bottom metal, no additional parts required. The optional adjustable magazine release lever gives you fine-tuning control, allowing up to 0.080 inches of height adjustment to dial in reliable feeding with your chosen cartridges. At 14 ounces, the UMC adds minimal weight while maintaining the rigid bedding precision that matters for accuracy.

This is the real-world solution for serious shooters who want modularity without complexity. Whether you're building a long-range rig, testing barrel loads, or simply want the option to run different calibers, the Grayboe UMC system gives you the foundation to do it efficiently. Howa 1500 short action shooters get a production-proven platform that respects both your rifle and your investment.

Key Features

• Quick-changeout design anchors with two screws into Grayboe Flagstaff Core and Renegade 2 stocks
• Accepts standard AICS magazines—no additional bottom metal needed
• Optional adjustable paddle-style magazine release lever with 0.080 inches of height adjustment for cartridge feeding optimization
• Precision T6 6061 billet aluminum construction with Cerakote black finish
• Enables multiple rifle and caliber configurations from a single stock
• Weighs 14 ounces

Specifications

Frequently Asked Questions

Will this chassis work with my Howa 1500 short action rifle?

Yes. The Grayboe Universal Mini Chassis is designed specifically for Howa 1500 short action rifles. Your rifle bolts directly to the UMC, which then anchors into your Grayboe stock with the two provided screws.

What magazines does the Universal Mini Chassis accept?

The UMC accepts standard AICS magazines. Use short-length AICS magazines for short calibers, or 3.850-length AICS magazines for longer calibers. Magazines click directly into the bottom of the chassis—no additional bottom metal is required.

Can I use this chassis to swap between different rifles or calibers?

Yes, that's the core advantage of the system. Once you have a UMC inlet for your rifle configuration, you can swap rifles and calibers by unbolting your rifle from the UMC and bolting in a different one. The UMC itself remains anchored in your Grayboe stock with just two screws.

Is the adjustable magazine release lever included?

The adjustable paddle-style magazine release lever is optional. It provides up to 0.080 inches of magazine height adjustment for optimized cartridge feeding, but it is not standard equipment with every UMC.