Alias MKX 18 round cap
thingiverse
I don't suggest using this for an actual paintball game, but I think it's fine for casual off-field fun. It appears to hold 18 .68-caliber paintballs. This product hasn't been field-tested yet, but if it opens smoothly and you have four M3 bolts that are exactly 20mm long, I believe it should work just fine.
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