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NAVIGATION
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this is the FAP MK4 and it uses the blow forward type valve, the long forward throw of the piston and the long
firing chamber would allow it to brech and fire a round on the forward
and rearward strokes (through a hole in the top of the breach ram)
hense doubleing the rate of fire, this is not not shown below as im
still working on this design. its design is supesed to be as simple to
build as posible but there are still complications.
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