This week we’re searching for an inexpensive spring for XDM shooters that prefer 
last-round slide lock over the +1 (but no slide lock) capability of the Grams spring/follower kit. Turns out the factory XDM spring resembles the Glock spring — but with some important little quirks. Currently if you want the full +3 you’re stuck with the stock spring and its “iffy” last-round lockback after 50 cycles or so.
Using a 140mm Glock spring gives you +2.5, and locks the slide back positively.