I've broken my Yeethammer a couple times by accidentally firing when the bolt was open, resulting in it crashing into the front and the breach not having enough time to close.
This mostly prevents that, by locking the trigger when the bolt is all the way back. You can still carefully de-prime it by pushing the bolt a little bit forwards.
why is that yeethammer so long…
Just press the “trigger-lock” into the “body-pt-guide-fore-reinforced-trigger-lock” like this:
You may need to shave the sides of the lock or sand it depending on print tolerances, it should be a press fit. It will take a little bit of force to push this assembly over the lump at the end of the “trigger-aft-lock”, but it does fit so just give it a nice firm press and it will clear.
You will need to replace the trigger with the files here as well.
The author remixed this model.
Modifies the plunger tube guide fore component and trigger.