I am starting to like the Cx4. I initially thought it was igly as sin but it's growing on me. So I have a few questions.

The biggest appeal to me is having a pistol caliber carbine that can take the same mags as a handgun. (damn Glock for not having jumped on this bandwagon ).

Cx4 and Px4:
1.) Mags of the same caliber are interchangable, correct?
2.) .45 ACP mags are double stacked, right? I read they only hold 8 rounds? That seems kind of low for a double stack, doesn't it? Or was that a restricted state's version?
3.) What's the highest capacity mags you can get in both .45 and 9mm? For a carbine, a 10-15 round mag seems kind of weak IMHO.
4.) Anyone have a definitive answer on threading/suppressing a Cx4? I am tracking two threads that are polar opposites on the issue. Illegal vs Legal.

more questions to come as i think of them...