Grayboe Universal Mini Chassis For Howa 1500 Long Action Black

The Grayboe Universal Mini Chassis for Howa 1500 Long Action is a modular bedding block system that transforms how you configure and switch rifles between stocks. Built from T6 6061 billet aluminum and finished in durable Cerakote black, this chassis lets you mount your Howa 1500 long-action rifle to the UMC, then install the whole assembly into Grayboe's Flagstaff Core or Renegade 2 stocks. The result: a single precision stock that can accommodate multiple rifles and calibers without re-bedding or guesswork.

This is the smart solution for shooters who own multiple long-action rifles or calibers and want the consistency and precision of a quality chassis stock without buying separate stocks for each gun. The UMC seats and locks with just two provided screws, so swapping rifles takes minutes. Once installed, your Howa bolts directly to the aluminum bedding block, which then interfaces seamlessly with your Grayboe stock. You're not chasing fit; the engineering is already dialed.

Magazine compatibility is straightforward: the UMC accepts standard AICS magazines directly—no bottom metal required. Long-action shooters use 3.850-length AICS mags for proper cartridge feeding. An optional adjustable magazine release lever is available, offering up to 0.080" of height adjustment to fine-tune feeding dynamics for your specific ammunition. At 14 ounces, the UMC adds minimal weight while maintaining the rigidity that precision shooting demands.

Key Features

• Modular design allows rifle and caliber interchange within compatible Grayboe stocks
• Precision-bedded T6 6061 aluminum construction with Cerakote black finish
• Direct AICS magazine compatibility—no additional bottom metal needed
• Optional adjustable magazine release lever for cartridge-feeding optimization
• Quick-change anchoring system: two screws secure the assembly to your stock
• Lightweight at 14 ounces without sacrificing rigidity

Specifications

Frequently Asked Questions

Will this Universal Mini Chassis work with my Howa 1500 long action?

Yes. The Grayboe UMC is designed to fit Howa 1500 long-action rifles. Your rifle bolts directly to the chassis, which then anchors to compatible Grayboe stocks with the two provided screws.

What magazines does the Universal Mini Chassis accept?

The UMC takes AICS magazines without requiring bottom metal. For long-action calibers, use standard 3.850-length AICS magazines. Mags click directly into the bottom of the chassis.

Can I swap different rifles into the same stock using this chassis?

Yes, that's the core benefit of the UMC system. As long as your rifles are compatible with Howa 1500 long-action inlets and you have a UMC for each rifle, you can interchange them into Grayboe Flagstaff Core or Renegade 2 stocks without re-bedding.

Is the adjustable magazine release lever included?

The adjustable magazine release lever is optional. Contact Bosque Outdoors to confirm availability and add it to your order if desired. It provides up to 0.080" of magazine height adjustment for optimized feeding.