Can Tikka 5rd mags convert to a 10rd mag?

[teddy12b]

I've got a Tikka T3X CTR in 308 and I'd like another 10rd mag or two. The 10rd mags seem to be out of stock, and I do see some 5rd mags laying around. Is it just the follower that makes it a 5rd mag or are there detents in the steel body. I'm hoping that there's either some easy way to convert a 5rd into a 10rd, or someone knows a place that's got 10rd mags in stock that I'm not aware of. I just didn't want to drop the $$$ on a 5rd magazine if it couldn't be converted easily.

Thoughts?