AIRSOFT MAG ADAPTER NATOMAG - AUGMAG - longer BB tube
thingiverse
This is just one piece from this: http://www.thingiverse.com/thing:620955 You will need the rest from there. I printed the original but the tube that fits into the magazine wasn't long enough and didn't push the BB retaining pin in place. Edit: I made the same change to the updated part too, that's the M4_part2.stl
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