Well, sure, that's very nice! PM incoming. I have the original 7-round mag and later picked up a 10-rounder. And I know there were some 15-shot mags made later. That style magazine was used on a few Mossberg models around the time but I'd be surprised if there are many working examples of the rifles left as they were prone to breaking firing pins. The attachment to the bolt was machined too thin for a semi auto. I replaced pins several times and the last remanufactured ones I got from Numrich/Gun Parts were defective. I have one left.