Ok heres the deal My M&P 340 came in today and I took her home upon further inspection when I spin the cylinder in the open position you can notice a slight wobble of the cylinder. Seems like the ejector rod has a slight bend causing this. Will smith just send me a new ejector rod or will i have to send it in to them. The lock up also is not as tight as my other j frames but the trigger is among the best. Should I worry about this issue or let it be? It cycles fine. Thanks guys.
bent ejector rod?
- Thread starter kpla51
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girvin02
Member
If you're a do-it-yourselfer, this video will show you how to straighten it. If not, I would call S&W, assuming the gun is under warranty.
https://www.youtube.com/watch?v=0QEsDAI44Ns
https://www.youtube.com/watch?v=0QEsDAI44Ns
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its nowhere near what the video shows it still goes in and out smoothly and opens and closes perfect. Its very slight but i can notice it maybe I'm OCD. Id rather have smith send me one so I can fix it quick instead of being out of a gun for a few weeks maybe months since the holidays.
This is New and was never on a display case. It hurts me when people do that
Ok i just pulled off the cylinder and it looks like there is a very very slight bend in the ejector rod. Im sure 90 percent of owners wouldn't notice it but I'm super OCD about guns being perfect until i mess them up personally. If anyone knows if smith will send me a new one that would be awesome. If not brownells has some but I'm not sure which one I need. Maybe this one?http://www.brownells.com/handgun-pa...son&avs|Make~~Model_1=Smith & Wesson__J Frame
On a good note the trigger is almost as good as my 60 pro, its super smooth. Im in love the ejector rod is fixable so I'm not super worried.
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Ok since i have other j frames i got to work. I took out the internals of the M&P340 cylinder and replaced with some from a 442 that did not have this issue. Still has a very slight wobble so my conclusion is that the cylinder may of been machined a bit out of round. It also is not the crane I've checked that too with others.
You may want to get it fixed because it can cause a variation of trigger pull by cylinder chamber, although for the degree of wobble you describe, it is probably OK. One thing you need to remember about replacing ejector rods to fix cylinder wobble is that sometimes the front or back ends of the ejector rod have deformed threads in the joint between the front and back sections. If the damage is is in the back piece, even a perfect front won't fix the problem. It's actually fairly easy to fix a bent rod by taking the assembled rod (without cylinder), and roll the rod on a flat surface. Observe the point of maximum deflection and use a small hammer to gently tap the rod in the correct direction. Several iterations of this will usually fix the problem.
I built a rotary jig with a dial caliper to measure TIR, but I think that just eyeballing it will do OK.
Buck
I built a rotary jig with a dial caliper to measure TIR, but I think that just eyeballing it will do OK.
Buck
Like I said its super minimal. I can only tell if i look at the pin in the center of the ejector and if spun fast i can barely feel the wobble.
