You have a powerful selection for a 700. Here are some:
H&S -- They work. The mags aren't as good as AI, but it will fit in your factory stock.
V-Bull,ATRS AICS mag systems -- work really well. Require some fitting to your stock, and maybe rifle. This can be done with hand tools though.
ATRS AW mag system. Same as above, but use shorter AI AW double stack mags. I would do this in a heartbeat if I were doing it over again.
ATRS also had some side release mag systems last time I was in, though I don't remember the details.
There are piles of others, but I think they are either junk, or foreign versions of the ATRS, and V-bull offerings.