Hi Guys, can anyone tell me if this item is a genuine military store or not ? it is a solid aluminium cartridge with a brass base. The "primer" is made of rubber and there is no headstamp. One side reads: DRILL CARTRIDGE SHOTGUN 12 BORE L15A1 and the other side reads GE 03-01 448GO1. I am suspicious about it because one lot of markings looks different to the other. Sorry about the fuzzy pics, I was out and about when I took these. Your comments are welcome.