Hi Tone

The trigger blocks with their guts MK1/2/3/4/5/6 will interchange. --- I've just built up a bitsa using a MK2 cylinder/piston and MK6 back block and trigger assembly.

The big question is what part does your mate need as the threaded section just bolts to the back block with a hollow bolt.
The threaded section needs to be set in the correct position so that the back block aligns with the cocking lever slot when tightened.

I'll check out what spares Back blocks I have.



All the best Mick