I've been seriously considering buying a JRC (Just Right Carbine) in 10mm. I've read the reviews, but they're mainly about the 9mm version. It's gotten some really good press, and sounds like it's well made. My price for the Keymod Version is $525 plus $20 shipping.
My big question is, does anyone on this forum have one, or just tried one out. It is a blowback operated system, but I typically shoot between 180-200gr bullets in my handguns, and would probably stick to the same ammo for the carbine.
I have one in 9mm. It was problematic and they do not pay for return shipping. It is also needlessly difficult to completely take down for cleaning. You must remove the buffer tube to get the bolt out.