The discovery of only 12 spent AR cartridge cases doesn’t really mean all that much. Anybody who ‘s into shooting AR type rifles knows it’s possible to buy a cartridge catching bag that attaches to a rifle’s receiver. Makes collecting spent cases for reloading an awful lot easier. Naturally,such a bag could just as easily be used to catch spent cartridges to keep them from being used as evidence in a likely massacre.
“Anybody who ‘s into shooting AR type rifles knows it’s possible to buy a cartridge catching bag that attaches to a rifle’s receiver. “
As I understand, the bikers had bags on their 9mm. Possible up to one million rounds fired by bikers.