"Gun wouldn't stomach Winchester white box, 115 gr. 9mm Luger. Gun worked with 124 grain (sorry I don't remember the brand) after changing back to the recoil spring that came with the pistol."
Having been among those who tried to assist on the last go 'round, I'd like for you to expand upon your statement (above): Did the 39-2 fail to correctly cycle with the 124-grain bullets while using, if at all, the same spring used for the 115-grain projectiles which did not properly cycle?
(BTW: While used in my 39s are a variety of cartridges, I have used the Winchester "white box" rounds, such having worked flawlessly across a range of 39s - still, quickly noting that such is tough to precisely recall.
Later.