I received a non-functional 9mm S&W model 469 from a friend recently. It needs a new mag release, but that's easy enough. My problem is that when the gun is on safe, the hammer will not stay back. It will immediately follow the slide back forward and a round would presumably fire if the gun were powerstroked. The hammer will stay back if the safety is off, but the trigger will not drop the hammer. When the gun is put back on safe with the hammer back, the hammer drops. Yikes! What are some possible diagnoses? The hammer is in a flush position with the slide when the safety is off, but moves back slightly when the safety is engaged, I have no idea if this is normal. I only have limited experience troubleshooting handguns, and all mine thus far have been hammerless like my XD. Any help would be greatly appreciated!