I'm looking for a barrel to convert my G33 .357 sig into a .40 cal. I know there are barrels to convert G27 to G33. I'm not sure if I could just take the barrel from a 27 and drop it into my 33. I'd like to start enjoying some cheaper .40 ammo on occasion. However, I do know that you Can Not drop a barrel from a G22 into a G33. It took me 2 hours and 3 hands to get the slide back off!! I would appreciate any feedback.