After watching some disassembly videos on the .45ACP LC carbine, I was completely turned off by how thin and narrow the mystery grade aluminum upper receiver gets under the ejection port. It screams failure point to me. It's right where 10/22 receivers crack, and that's just from the measly .22LR recoil.
The recoil of .45ACP, or worse yet, 10mm with that behemoth two piece bolt against a hard stop (as in, not a recoil buffer tube), in a new unproven design from Ruger is a definite pass for me. I hope I'm wrong.