Wildcat huma

That is correct. The reg itself is the same, but the MK1’s and the early MK2’s that we’re pre AMP reg use the small 15mm spacer, while the AMP reg models require the longer spacer.

if you have an MK2 and are unsure if yours is pre AMP, the AMP style guns will have two holes in the air tube- one for AMP reg adjustment and a second hole 180 degrees on the other side with a black rubber ball stuck in it. If your MK2 has only one tiny hole, usually on the left side portion of the gun, then it is the old style , pre AMP reg