I bought this gun to carry for defense while bowhunting in northern Michigan (cpl holder).
This answer should be easy to determine. Check Michigan CPL law or MI DNR hunting regs on carrying your CPL gun for protection while hunting.
The hunting regs of some states with "Shall-Issue" CPL/CCW laws (at least the ones I'm aware of) allow the permit/license holder to carry for
protection and don't limit mag capacity, unless there's a general state law restricting the mag capacity for
all semi auto pistols, like to 10-rds.
I was also hoping to be able to take a deer with it during firearm season. This is where the problem comes in. Michigan only allows 8+1 in auto handguns.
That's a different question - now you're talking about
handgun hunting with the G20, not just carrying it for defensive use. Michigan, and other states, can and do limit the mag capacity of semi-autos (pistols
and rifles) when used for hunting. I know a few guys who use their M1 Garands to hunt deer with in northern Mich and in the U.P. IIRC, MI restricts capacity in
semi-auto rifles to 6-rds, so these guys use 5-rd "hunting" clips.
Again, check state law or get clarification from Mich DNR.
My glock for some reason only came with 10 rnd mags but they are still over capacity. Is there any other manufacturers mags that will work in this gun? I thought I heard that some kimber 1911 mags will work?
Sounds like you got hosed from your dealer on the mags, unless MI has a state-wide law restricting mag-capacity to 10-rds for
all semi-auto pistols. Don't know (?) My Glocks all came with full-cap mags.
As far as using Kimber's 1911 mags??? - no way in your Glock. The mags for each are two entirely different animals, as are the pistols they feed.