I assume you mean the gas ring is too long. I've had that a couple of times years ago and it isn't that big of a job. You can either have a machinist take care of it or do it yourself. In my case I tried several combinations of washers that fit over the gas ring until I found a combination of thicknesses that left a tiny bit of the end exposed. A good file can take care of the length since the metal isn't really all that hard. The washers will sit nice and flat on the face of the cylinder and prevent cutting too much. Work slow and check the fit often. Remember you can always cut a little more off, but you can't put it back if you get too enthusiastic with your filing. A few strokes of the file reduced the length and the washers keep the trimming nice and flat. You can even use various thicknesses of paper between the cylinder face and the washers for finer tuning of the amount to be filed off.
Is your Ruger a 3 screw or 2 pin New Model? The frames are different sizes and a NM cylinder will never fit in a 3 screw.
That's the way I would start. Cut a little less off if you can. Most cylinders are fitted by the factory a little loose. You want as little front to back play as possible and still have the cylinder rotate freely.
Once the cylinder will go properly in place, be sure to check on the indexing of each chamber at full cock as well. This can be done with a borescope or by slipping a bore-fitting dowel down the bore and feeling for the mouth of the chamber. If you feel the edge, this would suggest alignment is off...not a good thing. A thin probe held firmly against the side of the bore could also serve. Do this check all the way around the edges of each chamber.
No, my 45 long colt wasn’t either. And got lucky. Thought I try it again, not as lucky.
You're welcome. Glad it helped you out. Now be sure you let us know how it shoots!
Ball gap(cylinder gap) you can barely see light through gap. And never checked head space.
