The FX Wildcat MK3 & MK3 BT Side Shot Mega magazine is available in the following calibres:

4.5 mm / .177 – 22 rounds
5.5 mm / .22 – 18 rounds
6.35 mm / .25 – 16 rounds
7.62 mm / .30 – 14 rounds

Not suitable with Wildcat MK1 or Wildcat MK2