The CrossTac AICS Short Action Single Shot Adapter pulls double duty as a maintenance block. Two angles are milled into the base of the block, when you use this as a maintenance block you can mount the rifle parallel with the vise or at 10 degrees downward so solvent flows to the muzzle end and not the action. The block features an adjustable nylon screw system to make it fit the mag well dimensions perfectly. The adjustable mag catch allows you to determine how tight it fits before it clicks into your particular rifle. Generous travel adjustment allows it to fit all rifle configurations. Cycle the bolt slow or fast, it feeds reliably. Fits all bottom metals, feeds all calibers 223 on up to the fat overbore cases.