A pretty simple shotshell holder with a flat back. Intended to be glued to side of my shotgun's receiver with E-6000 glue. It's to make reloads a bit faster for sport shooting matches.The design holds shotshells just fine. But whether the glue will be enough is another story. On one hand nothing I have glued with E-6000 has come apart on its own. On the other hand, being stuck to a shotgun (which gets hot) and subjected to stress of repeatedly pushing in and pulling out shells on top of it all is beyond what I normally put E-6000 through.P.S. Hahahaha "sports" isn't even close to being a Category choice for things. 'Other' it is!I designed in Sketchup and scaled up by 3% to get a fit that was just the right balance between firm enough to hold and loose enough to be workable. The .STL file is all pre-scaled and everything, however.The sketchup file is attached if you like, you should be able to easily expand it to more if you like. Due to the limitations of my cupcake's build platform I needed to print two of these and mount them separately.