The 9mm and the .40SW ones are interchangeable. You just have to tweak the lips.

so, for example, are the same exact mags in the SC, Service and Tac 9mm?

You'll need a mag spacer to run a full-size mag in the SC's shorter grip.

http://www.pistolgear.com/proddetail.php?prod=10AGA

You don't necessarily NEED a spacer, but it'll feel better and look better.

Originally Posted by sje0123

You don't necessarily NEED a spacer, but it'll feel better and look better.

Right. I should have been a little clearer in my post.

i was told my SC i ordered is coming with 2 different capacity mags, anyone know off-hand what to expect when they arrive?

You should be getting one 10 round mag and one 16 round mag w/ mag extension.

Originally Posted by sje0123

You should be getting one 10 round mag and one 16 round mag w/ mag extension.

16 rnds? sounds good to me, thnx!