OK, rather than go to the main forum, I wanted to ask you BullDawgers... I am considering buying a G37, because I am intrigued by the GAP round. I know that there are no existing subcaliber barrels that will fit this slide BUT.... can I simply replace the complete upper (slide & barrel) and the ejector housing with G22 parts to convert this frame over to .40 for range use? Or is the locking block and other parts specific to the GAP, making it a bad idea from the start? Considering that the G22 that would loan these parts is my Gen2, I wouldn't even consider trying to reconfigure that frame as a GAP. Thanks in advance... Wanna kill these ads? We can help!