I have a JRC in .40sw.
I origionally bought it in 9mm. Worked flawlessly and was surprisingly accurate. The I bought the .40 conversion, slapped that on and sold the 9mm. The 9mm is cheaper to shoot, but the LEO's here use .40sw and they are ballistically similiar. That and I ca get a bunch of .40 for free which is nice. I have had absolutely no issues with the .40sw EXCEPT when i used .40 in my 9mm glock mags. Then the last few rounds had issues, but thats my problem.
The new JRC's aside from the .45acp have no issues now. Buy one, with no regrets and mod the sh!t outta it!.
I highly recommend it.