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cylinder lock up on GP revolver

This is a discussion on cylinder lock up on GP revolver within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; How tight should the cylinder lock up be and how do you judge/measure it? I looked at an old S&W 19-6 last week and cylinder ...


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Old May 8th, 2017, 02:11 PM   #1
 
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cylinder lock up on GP revolver

How tight should the cylinder lock up be and how do you judge/measure it? I looked at an old S&W 19-6 last week and cylinder lock up was way tighter than either of my GPs. I'm not really concerned,but curious.



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Old May 8th, 2017, 02:57 PM   #2
 
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"Lock up" can mean a lot of things to a lot of people.

On a S&W or Ruger, there's a little bit of play even at the moment of firing. The cylinder will be held in place by the bolt (cylinder stop in Ruger lingo) and the cylinder will align with the barrel as the bullet enters the forcing cone. On a Colt DA revolver the hand (pawl) will force the cylinder against the cylinder bolt at the moment of firing and the cylinder will be held tight at the moment of firing. Both systems have pros & cons.

You cannot look at one Ruger and one S&W and declare a particular make is "tighter" than the other. I've seen varying degrees of play in BOTH Rugers and S&W's. If the gun isn't spitting/shaving lead and is accurate; it's not a big deal to have a little play. Colts are a bit different because they should be tight at the moment of hammer fall.

By necessity there must be a little play when the cylinder closes into the frame but it is minimal. The cylinder is held in the frame by a pin protruding from the rear face of the extractor and in the case of GP-100, the lock on the crane. Despite those two points locking the cylinder in place, there must be a little clearance in order for everything to function under a wide range of conditions (temperature, dirt, etc.) Again the Colts are a bit different. The Colts reverse the setup and the pin that locks the cylinder in the frame protrudes from the recoil shield into a recess in the center of the extractor but it does the same job.
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Old May 9th, 2017, 02:44 AM   #3
 
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Got it. Good info, thanks
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