I'm not sure. By looking at the webpage below from Wolff Gunsprings, it may be around 17 lbs. to 18 lbs. for that pistol and caliber. Just a guesstimate on my part.I have a question. Having a 940 model, when racking the slide I'm feeling poor spring tension. Explained this, what is the standard weight for the recoil spring on the PT940?