I received my new Mark III 22/45 4 1/2" this week and have put 500 rounds through it (great shooter, ate a lot of junk ammo with NO stoppages). The only thing that bothers me is the hammer pivot pin walks to the left approximately 1/16" (leaving the flat headed side out with the 1/16" gap between the head and side face of the pistol).
The right pivot is still supported + or - 80% pin and seems to stop at this point. However, it is noticeable and I push the pin back in every 30 or so rounds. Is there a simple solution to prevent the walking? I guess that I can live with it........but I would rather not.
New 22/45 (Mark III) hammer pivot pin
Moderators: Bullseye, Moderators
If the sear spring is installed properly that pin cannot walk at all. Check to ensure the long leg of the sear is installed on the rear side of the pivot pin. To do this you will have to remove the receiver. The pin should be positioned like this one.
When locked in place that pivot pin head is firmly held against the frame.
Hope this helps.
R,
Bullseye
When locked in place that pivot pin head is firmly held against the frame.
Hope this helps.
R,
Bullseye
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woodspirits
- New member
- Posts: 9
- Joined: Tue Dec 11, 2007 12:54 am
- Location: Indiana
Maybe the photos will show the hammer pivot pin walking more clearly. The position of the sear spring into the pivot pin groove is with the pin to the far left position (as shown in photos 2 and 3. It is self-limiting and I do not see how the pin could walk out far enough to damage the bushing area on the right side. If the groove in the pin was cut closer to the flat head, than the walking would be very negligible. Many thanks for your help.
The photos of your pistol's hammer pin help significantly. I agree with your assessment that the pin's movement to the left is not enough to cause any damage to the frame. The right side of the frame is nearly twice as thick as the left around the hammer pin support hole.
There is another possibility. That particular hammer pivot pin may be out of specs. It could have been one that slipped through quality control. The groove in your picture appears wider and flatter than that of the others I've handled. The groove should be more cupped shaped like the one in this picture.
I didn't originally post the Mark 3 22/45 picture from my maintenance pages because I thought they were too dark for this answer. Here is another view with the pin and spring properly positioned.
According to your pictures, your sear pin is in the correct place to lock the hammer pivot pin. Notice in my lower picture that there is a little shoulder visible on the pin when locked in place. But that shoulder width is less than half the diameter of the sear spring's leg. That doesn't appear to be the amount of movement you're seeing with your pivot pin. I'd call Ruger and explain your problem and request that they send you a new pin. I'm sure that they would send one, no charge, based on my past exchanges with them on these hammer pivot pins.
Hope this helps.
R,
Bullseye
There is another possibility. That particular hammer pivot pin may be out of specs. It could have been one that slipped through quality control. The groove in your picture appears wider and flatter than that of the others I've handled. The groove should be more cupped shaped like the one in this picture.
I didn't originally post the Mark 3 22/45 picture from my maintenance pages because I thought they were too dark for this answer. Here is another view with the pin and spring properly positioned.
According to your pictures, your sear pin is in the correct place to lock the hammer pivot pin. Notice in my lower picture that there is a little shoulder visible on the pin when locked in place. But that shoulder width is less than half the diameter of the sear spring's leg. That doesn't appear to be the amount of movement you're seeing with your pivot pin. I'd call Ruger and explain your problem and request that they send you a new pin. I'm sure that they would send one, no charge, based on my past exchanges with them on these hammer pivot pins.
Hope this helps.
R,
Bullseye
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woodspirits
- New member
- Posts: 9
- Joined: Tue Dec 11, 2007 12:54 am
- Location: Indiana
I will call Ruger in regard to the hammer pivot pin. Playing around with the pin position, when I push it in toward the right to where the flat head is tight against the frame, the trigger pull has an annoying initial "catch". When I push it in slightly back to the left (with a small gap between the frame and flat head of the pin) the trigger is very smooth.
Bullseye, I really appreciate your time and help.....you are an attribute to the shooting sports.
Bullseye, I really appreciate your time and help.....you are an attribute to the shooting sports.