Make sure you have decent ammunition and if thats not your problem.
Check the mainspring, if its been cut even 1 coil it probably needs replacing, I think that gun needs a 10.5-11 lbs D/A press to be reliable.
Make sure it is empty, with an empty mag in the gun, again make sure the chamber is empty, press the trigger, if it make a dull sound and not a clean sounding twang, then the firing pin / channel/spring is probably full of crud,( technical term), and slowing or blocking the pin..
If neither of those then, it might be a safety lever, in which case, unless you know how to fix it, and have the part, the gun needs to go to S/W or a gunsmith, Good luck, Bob
Actually you might want to check the firing pin first, alot of times, that alone fixes the problem,even if the mainspring is weak.