Frants Pedersen Posted May 31, 2015 Share Posted May 31, 2015 Hi having problems with my S&W 686-4, maybee 1 out of 100 round dont go of, what might be the problem ? hope that one of you could give me a hint Best rgds Frants sogw.pdf Link to comment Share on other sites More sharing options...
alecmc Posted May 31, 2015 Share Posted May 31, 2015 (edited) Increase main spring pressure by tightening the strain screw. Also, lock tite it with blue or purple loc-tite so it doesn't back out during use. Additionally, you may consider an aftermarket firing pin like the apex tactical, or a factory pin that measures .495 in length Edited May 31, 2015 by alecmc Link to comment Share on other sites More sharing options...
cooper_999 Posted May 31, 2015 Share Posted May 31, 2015 Hi Frants, strike looks slightly out of center? Maybe, on 1 of 100 multiple issues come together like not properly seated primer plus a slightly outcenterd strike - voila, misfire... Could it be, that one chamber has a little bit worn cylinder stop notch? Or the star is worn a bit... Just food for thoughts... Btw - I'm still waiting for your promised email after the Steelchallenge ;-) Best regards, Sascha Link to comment Share on other sites More sharing options...
okshootist Posted May 31, 2015 Share Posted May 31, 2015 I would start by checking crane alignment and endshake. Link to comment Share on other sites More sharing options...
Waltermitty Posted May 31, 2015 Share Posted May 31, 2015 Also don't forget to check for high primers. All primers should be slightly below flush when reloaded. Link to comment Share on other sites More sharing options...
bountyhunter Posted June 2, 2015 Share Posted June 2, 2015 (edited) Check endshake and also cylinder gap back to recoil shield (breech face) which I think is supposed to be nominal .062" (min about .060 and max about .064"). Endshake should be not more than .001". I would inspect the hammer for frame drag as well. If this is a MIM gun with external firing pin, clean and inspect it and make sure it moves freely. Use calipers to verify it is .495" length, not a defective shorty. NOTE: the most common culprit I see for "marginal" strike energy is when the strain screw gets worn at the tip. It only takes a little to do it. Edited June 2, 2015 by bountyhunter Link to comment Share on other sites More sharing options...
Carmoney Posted June 6, 2015 Share Posted June 6, 2015 Most of the wear to the strain screw tip can be avoided by not cranking them in and out constantly. Set 'em, loctite 'em, and leave 'em alone! Link to comment Share on other sites More sharing options...
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