I've printed this and tried to put it together. There are a number of problems with this design versus a standard C9 parts kit:
1) the magazine safety spring detent has been removed from the design.
2) the thumb safety detent has been removed from the design.
3) the counterweight slot is too narrow to accept a standard counterweight.
4) the magazine catch port is too big.

I ended up with a very awkward club. With the addition/modification of these features, it would be a great design.

Are you going to at some point upload a version with safety.

sweet

ok

nice