The Mac 1 and 2 were both designed and built by Ken Turner, with input from Dave and Ivan.

KT DID NOT design and build the Mach 1's or Mach 2's he worked for a company that Dave and Ivan approached to build these wonder guns. They sent the designs and the company produce parts and then the venom team built them at the gun barrel works. CD stands for Copied Design as they copied the Mach 1 trigger for the first examples of this trigger.

Mach 1 was introduced 1987 and only 17 made. Mach 2 produced around 1990 and only 8 produced. Trooper Walsh first approached venom in 1987 to produce a wonder lever hence the Mach 2 was first thought of in 1987.
Mach 1.5