I'm thinking about getting a cz 527. It seems with the detachable magazine that someone would be building a hi cap replacement offering 8-12 rds of ammunition.
Agree that it would be nice, but don't know of any (yet.) www.ableammo.com would probably have one if it's made.
I just bought a 527 American. Seems pretty nice, so far. www.jerrycalhoon.com is making neat stuff for 527's, including a modified bolt handle and low rings to get that scope lower.
I have had my 527 for awhile now and never thought about a hi cap mag for one. I am sure it could be done but I don't know if there is one out there. Most states don't allow a weapon to hold more than 5 rounds when hunting so I don't know if it would be profitable for a company to produce something that would have limited use. Not only that when target shooting you rarely shoot more than a 5 round group.