What made these marks?
- Thread starter mikesb
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I would say that for the Firing Pin to make those marks the revolver would have to be grossly out of time! Hopefully it is NOT anymore but maybe at some point it was. The marks on the outside of the cylinder are from the cylinder lock and to me they look quite extreme. The line on the cylinder is also quite pronounced and this may have been one abused revolver! The other possibility is that it was built on a Friday at 4pm and never fit right. I'd examine the cylinder lock and check for chips and or burrs - correct or replace if necessary. Some wear and some raising of a burr is not abnormal (as is a cylinder turn line) after heavy use, but I'd carefully go over this one.
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Yes, the "punch" marks were made by the hammer nose (firing pin). I generally associate a wide turn line with a gun that developed excessive endshake. Your Highway Patrolman was obviously shot a lot.
Have a competent gunsmith inspect the timing and endshake. Neither is a terribly expensive fix.
Have a competent gunsmith inspect the timing and endshake. Neither is a terribly expensive fix.
Protocall_Design
Vendor
The wide cylinder marks are from a cylinder lock that has a wide area of contact with the cylinder (flat on top, rather than round).
The dents are firing pin marks from where the cylinder skipped when the trigger was pulled quickly. The reason it skipped is because the ramps leading into the slots are too shallow. If you compare this cylinder to one with no problems you will see the difference. I have a 627 that had that problem. I milled the ramps to the proper depth and it has worked fine since then.
The dents are firing pin marks from where the cylinder skipped when the trigger was pulled quickly. The reason it skipped is because the ramps leading into the slots are too shallow. If you compare this cylinder to one with no problems you will see the difference. I have a 627 that had that problem. I milled the ramps to the proper depth and it has worked fine since then.
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I find it hard to believe that the firing pin could dent a cylinder, or even the extractor, unless it the same place a lot of times. I think someone used a punch, but I can't imagine why.
dfariswheel
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Nope, it happens surprisingly often in abused or badly worn revolvers.
A hardened firing pin can very definitely put impact marks on a cylinder that's always softer then the firing pin.
Think about it...... you can put punch marks on a cylinder with a hardened punch when tapped with a hammer.
Now imagine the punch is a firing pin and the hammer is a revolver hammer.
I've seen this on both revolvers that had the firing pin mounted on the hammer and in guns with the firing pin mounted in the frame.
I agree that the marks are from a the firing pin while the cylinder was out of line. I also agree that the gun has a lot of endshake. If the cylinder goes way forward the hand will slip off the ratchet early and possibly even skip.
Either that gun has been fired a lot, rapid fired a bunch or the cylinder has been spun and slammed shut a lot. You can see peen marks and raised metal on the cylinder slots. Needs a serious rebuild.
Either that gun has been fired a lot, rapid fired a bunch or the cylinder has been spun and slammed shut a lot. You can see peen marks and raised metal on the cylinder slots. Needs a serious rebuild.
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Alk8944
US Veteran
Not real common to find dents on center-fire cylinders, but it is too common on rim-fire revolvers. Looking at the overall condition and peening of the cylinder stop notches I would say this gun has been shot or dry fired in FAST double action way too much, and because of the battered stop notches the gun will "Throw-by" sometimes in double action and the hammer nose strikes the cylinder or case head instead of the primer.
Goblin, you may have a hard time believing it, but it takes once for the hammer nose to strike the back of the cylinder to cause dents like these! Once for each dent.
As steelsaver said, this gun needs some major repairs! Even a new cylinder to put it right!
Note: Dents like this only occur in rim-fire revolvers and recessed chamber center-fire guns. The hammer nose will not reach the back of the cylinder in non-recessed guns!
Goblin, you may have a hard time believing it, but it takes once for the hammer nose to strike the back of the cylinder to cause dents like these! Once for each dent.
As steelsaver said, this gun needs some major repairs! Even a new cylinder to put it right!
Note: Dents like this only occur in rim-fire revolvers and recessed chamber center-fire guns. The hammer nose will not reach the back of the cylinder in non-recessed guns!
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My GUESS is that this Revolver was out of time, out of spec. and out of adjustment and instead of recognizing and addressing these issues, the Revolver continued to be heavily used. The evidence is seen in the firing pin hits between charge holes, the wide turn line and burrs on the cylinder notches. Apparently the original owner did not pay much attention to his revolver and this is what the end result is here.
Hence, close attention should be paid to the condition every time a firearm is cleaned. If something looks out of the ordinary or just not right, addressing it right away can avoid many issues.
Hence, close attention should be paid to the condition every time a firearm is cleaned. If something looks out of the ordinary or just not right, addressing it right away can avoid many issues.
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Thanks to everyone for their replies.
The gun had been repaired before I bought it. Timing is good and endshake is .001. I think it was refinished before repairs were done and all the sideplate screws look new.
Toolguy, I did compare the cylinder to one on my 29-2 and looks the same.
The gun shoots quite well and have had no problems with it.
The gun had been repaired before I bought it. Timing is good and endshake is .001. I think it was refinished before repairs were done and all the sideplate screws look new.
Toolguy, I did compare the cylinder to one on my 29-2 and looks the same.
The gun shoots quite well and have had no problems with it.
