Cyma Shells holder
thingiverse
Simple holder for 4 shells, used for Cyma shells (Tokyo marui standard I think). The inner diameter is 20 mm, other ones I found were 19 mm or 21 mm, so either too tight or too loose. A little bit of sanding from the inserting side is recommended so it won't scratch stickers on the shells. Attached it with Tesa Velcro.
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