The Grayboe Flagstaff Rifle Stock System is Universal Mini Chassis compatible. Shoot multiple brands of rifles and calibers out of the same stock. Short or long action, Remington or Howa, it doesn't matter. They all fit the stock the same. If you have a Grayboe Mini Chassis for it, it fits. The Flagstaff is molded from impact-resistant polymer, lightweight yet rugged. Trusted in military and industrial applications. It's weather resistant, trail tested and built to perform season after season.This kit includes the Grayboe Universal Mini Chassis (UMC) fits into the Flagstaff, Core and Renegade 2 stocks. Your rifle bolts to the UMC, then you bolt your rifle with the UMC on it, into your Grayboe stock. With a UMC inlet for your rifle, you can interchange different rifles & calibers into the same stock. Shoot multiple brands of rifles and calibers out of the same stock. Short or long action, Remington or Howa, it doesn't matter. All Universal Mini Chassis (UMC) fit the stock the same. ...