The mini actions carbon stalkers and the superlight are two different guns with different actions and different barrels. Superlights have a 20” threaded barrel while the carbon stalker has a 20” non-threaded barrel. I agree all of them should be threaded, and I wouldn’t be butt-hurt if they were shorter than 20”.
Also, good info on the weight for the Grendel mini action gun. That is 6 oz over their advertised weight, but it’s still a really light gun. It would be interesting to know how close the superlight comes to their 4# 7 oz figure. I’ve been eying these superlights as a possible alternative to a Kimber.