Unless they got a tax stamp, this may be an issue:
FFL Registry: Gunsmoke LLC at Front Range Gun Club - Loveland, CO shows a type 01. Although they could be operating the gunsmith side of things with the FFL there under another name or even owner.Are they an SOT?
Just for what it's worth, shotgun shells will rattle apart given enough time loaded in a magazine that's on a bike.
Yep. The vibration in addition to the spring pushing on the shells deforms the plastic.