FX Wildcat Mag Holder #M27. Compatible with .177 .22 .25 and .30 caliber. Your magazine clicks securely into the Mag holder using it’s own ball bearing and can rotate for easy loading with one hand while on the gun. As many as 4 Magholders can fit on the Wildcat at one time. You can mount 1, 2, 3 or 4 in a variety of configurations facing either to the front or to the rear and on either side or on both sides. – 6061 T6 Aluminum – Black Anodize – CNC machined – Uses 2.5 mm Hex key