Manners stock and bottom metal

I have a Manners stock that is going back to them to be re-fit for a 111 in 300 Win Mag. This will be a hunting rifle with the sporter profile barrel. My question is, I see that ya'll are running after market stocks from McMillan and Manners both, but what are you doing for magazines? The stock 111 has the detachable magazine assembly. Is there a comparable aftermarket assembly that could be used that would match up with the action, maybe detachable? If not, I am open to using an internal magazine, but how do I do the conversion from the detachable magazine? Any help is appreciated. I keep running into dead ends on this question.

CDI makes one. I also think Sinman and SSS have ones in the works.