The original Hauck system required the lever to be initially moved forward against spring pressure to unlock the lever and to retract the firing pin before the breech block could be lowered.

The rebounding hammer modification allows the Mann-Niedner firing pin to retract and get out of the way of the lowering the breech block with out complicated mechanical input; a big deal! 

I needed to be able to hold the lever closed while it was holding the block in the firing position. This was complicated by the fact that pressure from the cocked hammer, to the mainspring, was trying to drop the block and lower the lever! I needed this fairly powerful latch. It uses a coil spring which can be replaced with a stiffer one if need be. I am happy with it so far. The lever has to push against the latch with some force before it releases. The upside; when the lever is released the required excess force ends up hitting the extractor; which is what we want! The extractor becomes an ejector!



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All the parts.

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Well executed machining on the action. Looks like you have punched all the buttons for a properly operating single shot action. 
Very creative and looking forward to the finished product.
Chuck

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The rather confusing front of the receiver! The two lower 1/4" holes contain nylon locking set screws, gently holding the breech block against the receiver recoil surfaces, through out it's travel. The barrel also contacts the breech block for the same purpose. 

The center 1/4" x 28 hole will attach the for end with a long rod like the one used through the butt stock.

The upper screw hole to the left contains an extractor pin  set screw.  I use an .001" over size hole for all action pins and use set screws to retain them.


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The wood is functional and good enough to shoot gophers at this point. I expect to finish the wood next winter. I used a 1" straight barrel in KHornet.