Them parts fit in the lanchester trigger group? Trigger only thing I’m stumped on my build.
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You can modify the tripping lever to work. That and a spring is all you need. Or just make a tripping lever. You don’t want the hinge if it’s going to be semi only.
Does your trigger bar have the hinge welded?
Regarding semi-auto firing mechanisms, have a look at how IMI did it decades ago, here: https://www.uzitalk.com/reference/li...l%20manual.pdf
Vaguely reminiscent of the system in a VZ58.
Cheers.