ECM (v1) 30cm Rifling Mandrel-9x19
note that there is a V3 version out there... https://odysee.com/@c0ld\_d8rk\_h8nd:8 this design is taken from a: Rifling Mandrel-9x19-6gr-polygonal-1in9.82-Twist-8.82mm-Bore step file. this for the use for a 300mm barrel and this can be…
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