P6 P225 slide not locking back
Just got a beautiful P6/P225 for a decent price and very happy with it. However, its not locking back on final round. I replaced the 2 mag springs (both mags have the issue). Ive cleaned the mags and the pistol numerous times. I did replace the hammer spring to 16 lb because the double action was one of the heaviest I have ever seen, with the 16 lbs spring its decent. I did replace the hammer spring before shooting it. Ive tried from 21 to 17 lb recoils springs. Im a little resistent to changing back to the 24 lb hammer springs because I dont have a sig tool and it was difficult to say the least in putting it in. Anyone think its from the hammer spring change? Should I send it back to sig to take a look?