In my state ofSD when hunting "game" species (i.e. deer) you can not use more than a 5 round clip in an auto (doesn't matter if rifle, carbine, etc..). I have hunted with my old enfield whic has a 10 round mag with no problems because it is not an auto.
For you situation you may have to put in a "filler piece" to restrict the mag capacity to 5 rounds, kina like you have to do with a shot gun to take the limit to 2 or 3 for waterfowl hunting. A small wooden dowl cut to length works great for a shot gun and should work for your situation. Just cut to length and remove bottom plate and insert into mag and it will rest between the mag spring and bottom plate.
Lifetime member VFW and NRA
"Quando Omni Flunkus Moritati" (when all else fails play dead) -Red Green