So i sent Ruger a note asking when they might build one in .40 cal. They were really nice but basically told me they could not tell me or they would have to shoot me.....
BTW
Colt was wise in it's making 9mm carbines with a 1/2x36 thread to keep a distracted shooter from screwing something on the muzzle with a 5.56 size hole. I'm more than happy to have designers protect me from myself.
I just would bet one of you guys have made such an error but won't admit to it (I wouldn't).