Modifying Magazines to Limit Capacity

[Great-Kazoo]

Other than for hunting purposes, why are we discussing riveting magazines?

No reason other than the OP concerned about greater than 15 rd mags. As already mentioned, UNLESS there's a date stamp of 7/13 or newer, there's nothing LE or a DA can do. The burden of proof is on them to show you didn't have possession prior to 7/13.

If it's the sterling mags being an issue. Which i don't know why anyone would want to alter a mag that's not a low budget item. You can use standard USGI mags and notch out a mag catch relief on any decent mag and alter them.