The FX Impact M4 has redesigned high-capacity magazines. The new magazines are made from a different, stronger material & have a new internal mechanism to ensure the inner drum rotates smoothly – even when fully loaded with some of the heaviest slugs on the market. 
 
			- 34 shot when Cal.177
 
- 28 shot when Cal.22
 
- 25 shot when Cal.25
 
- 23 shot when Cal.30
 
- 18 shot when Cal.35 
 
		 
This will fit the MK3 and MK2 ( providing your MK2 accepts the jumbo style magazines)