Thanks everyone for your input. I still haven't decided, but this information is very helpful. @ Tenn2, I recently stumbled upon them and have been thinking about this as my choice, but there is a shop about an hours away that builds 9m carbine for a little more. I'm going to check them out this weekend to get some more information because I pull the trigger. But again, like bloodlord77 said, I never know when I'd need a 5.56/.223. Ugh! Decisions, decisions!! And ammo is crazy high (for me, anyway) for this caliber. Again, thanks for the info!