The 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. If we have a UMC for it it fits. – Features – Optional Adjustable Magazine Release Lever – Optional adjustable paddle style release lever available on all models of the UMC gives you .080 of magazine height adjustment for optimal cartridge feeding. – Takes AICS Magazines – 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. – Quick Changeout – 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. – Material – The UMC is a bedding block weighing 14 ounces and made from T6 6061 billet aluminum and coated in cerakote black or hard coat anodized type III.