HELP! I have a mystery with my Colt Gold Cup series 70 MkIV. I shot it over the weekend and it shoots just fine. BUT....When I took it apart to clean it, I noticed this mystery. Something is peening the frame near the hammer at the back of the frame. You can see it in photo1. There is an indentation at the front of the wear track and another at the rear as you can see. You can even see from the rear that whatever did it actually chewed a little bit out of the frame leaving a very small space between the back of the slide and the corner of the frame where it meets the right side of the hammer. The only part that could contact this area is the plate that retains the firing pin. I looked closely at it and it showed some shininess from wear. So just for the helluvit, I stoned it down in case it was the culprit. But it is still a mystery to me what could make that part slam into the frame with enough force to peen a little dent and then slam (or drop) down again at the rearmost travel of the slide with enough projection to gouge the rear of the frame. Is there any force acting on this seemingly inert retaining plate?
In photo 2, you can see that I relieved the plate on that side just to be on the safe side. Any ideas what could cause this? I did stone the peened craters a bit just to put it back to a relatively smooth surface.
Now......mystery #2. In photo 3 you can see the wear pattern on the lower rail of the slide. Again at the right rear of it. See the intermittent wear spots? How in the world can a slide show wear at intervals? In fact, the whole right lower rail shows those triangular wear spots like the slide was either machined wavy or somthing is making it flex (?) as it moves back and forth. I would suspect the former as I can’t see any way that the slide
could come back in spurts. The gun is fairly tight. I have owned it from new back in the ‘70’s and it shoots fine, but I have never looked real close at it before. There is a small bit of sideways play in the slide when it is in forward position but not excessive. There is no
movement of the barrel at either end when in battery.
I would appreciate any info or experience you may have had with a similar situation.
http://www.tech-line.com/hockit/gun1.JPG
http://www.tech-line.com/hockit/gun2.JPG
http://www.tech-line.com/hockit/gun3.JPG
In photo 2, you can see that I relieved the plate on that side just to be on the safe side. Any ideas what could cause this? I did stone the peened craters a bit just to put it back to a relatively smooth surface.
Now......mystery #2. In photo 3 you can see the wear pattern on the lower rail of the slide. Again at the right rear of it. See the intermittent wear spots? How in the world can a slide show wear at intervals? In fact, the whole right lower rail shows those triangular wear spots like the slide was either machined wavy or somthing is making it flex (?) as it moves back and forth. I would suspect the former as I can’t see any way that the slide
could come back in spurts. The gun is fairly tight. I have owned it from new back in the ‘70’s and it shoots fine, but I have never looked real close at it before. There is a small bit of sideways play in the slide when it is in forward position but not excessive. There is no
movement of the barrel at either end when in battery.
I would appreciate any info or experience you may have had with a similar situation.
http://www.tech-line.com/hockit/gun1.JPG
http://www.tech-line.com/hockit/gun2.JPG
http://www.tech-line.com/hockit/gun3.JPG