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. FeaturesOptional adjustable "paddle style" release lever, available on all models of the UMC, gives you .080" of magazine height adjustment for optimal cartridge feeding.Fits all AICS magazines, no bottom metal required. Mags click right into the bottom of the UMC. Use standard short AICS mags for short calibers and 3.850" length AICS mags for long actions calibers.Anchors into the stock via 2 screws that are provided with each UMC, seating and locking the UMC with your rifle on it, into place.The UMC is a bedd...