.45acp
I have the .45acp version and I love it. The weight doesn't really bother me, as i only bought it to be a range toy/suppressor host(whenever I finally buy one). Haven't had any hiccups in about 500 rounds. I've run everything from range fodder, up to +P underwood extreme defender and this thing eats it all. The only thing that I am not a big fan of is how short the grip is. Other than that, no complaints. Oh, and if you have the 10mm or .45acp version, you can order magazine extensions from kriss that they use in the vector. Not sure about the 10mm, but that brings capacity up the 30rds for the .45.
If you like fun, I would highly recommend the LC Carbine.