Zinc 2.0 Drum Spring Mag
cults3d
Use drum spring instead of the mag spring. Drum spring with constant force is much cheaper and easier to source, also space and weight saving. Spring spec: 0.1 x 5 x 600mm Constant Force Drum Spring Only done 7 round and 13 round mags. Test shows the 13 round mag's capibilty increases to 15 round.
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