I wanted a compact .223 Rem storage box with a round count close to a full mag. Since I typically download one or two, I decided to go for a total of 27 rounds in a 3x9 layout. The step file is included and should be easy enough to add a row or column or for anyone to customize in any other way they like. Thanks and accreditations to templatemaker.nl for helping me come up with a box template design.
The author hasn't provided the model origin yet.