Ruger GP100 Double Action Trouble Shooting

[SullyVols]

What could cause a Ruger GP100 (brand new) to lock up in double action on one chamber, but not any of the other ones? It only occurs while loaded (but doesn't always occur) - and the issue is that when the chamber in question is lined up with the barrel, the trigger will not reset until the hammer is budged a bit.

At first it would do this even with spent brass, that has stopped - but it still does it when fired.

Didn't have this trigger reset issue in SA and I was firing in a slow controlled manner the whole time - .38 special and .357 magnum both.

Couldn't find this issue in a Google search though the trigger reset seems to be frequent gripe about the GP100

 

[joeschmoe]

Switching between .38's and .357's can sometimes cause severe fouling buildup in the cylinders that won't allow the brass to sit all the way in. Try cleaning the chambers really well (especially the one in question), to get out most of the fouling. Do a complete strip, clean and lube.
If that doesn't do it, contact Ruger for repair.

 

[Tony_the_tiger]

Could be a warped frame/bent crane/something funny going on with the hammer dog... I'd just call Ruger and ask them very nicely if they would please send you a call tag for a UPS pickup to have it serviced by a technician. This will get you peace of mind and a factory restoration.

 

[herkyguy]

my guess is you've got something slightly out of tolerance. I try to work out kinks on my guns, but that one sounds particularly tricky. ask ruger to send you shipping paperwork.

good luck.

i love my GP100. it has never failed me.

 

[PO2Hammer]

Maybe a bent extractor star?

 

[Akita1]

Maybe a bent extractor star?

Exactly what I was thinking; perhaps from the ammo switch or faulty spent shell ejection practice?

My GP100 has been flawless but I clean it thoroughly after each use, plus I only run .357 through it.

 

[ClemY]

You might want to take a look at the extractor star. The newer revos have done away with the alignment pins (at least on the S&W revos. I don’t have a GP100 at work with me to check) between the cylinder and extractor, and the extractor and rely on an X pattern which is a bit sloppier fit and requires a case to lock up properly. The cases can be a bit different in diameter and could cause just a touch of difference in lock-up. The cylinder locks up on the width of the hand on the flats of the extractor star. One of those flats could be just a touch higher/thicker than the others. It is just a tolerance thing. It should go away as the gun is broken in. You can accelerate the break-in process by dry firing.