Not familiar with the 10FCP K, but there are only two styles of bolt release...top & bottom. The newer bottom release has some limitations for aftermarket stuff, like stocks and triggers. It is located in front of the trigger guard.
There are also two different mag well styles witin the bottom bolt release guns. The original has the "bottom metal" (really plastic) as a separate, removable piece. This is good as you can switch it out with better stuff. It seems the later models don't have "bottom metal", but have incorporated the mag well as part of the stock. Not a good thing for when you decide to change stocks. With this style, it becomes necessary to purchase separate pieces at an additional cost.
We're talking magwells or bottom metal here, not the mag itself....which is also plastic, and replaceable at an additional cost.
If you're going to want to modify the rifle, look at the model 12's. Yeah, they cost more, but their worth it.