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Old December 30, 2018, 08:39 PM   #1
Felenari
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Light primer strikes on SW SD40VE.

So I've put about 2500 to 3000 rounds through my SD40VE and only had two malfunctions until recently. One stovepipe when I first changed recoil springs and one failure to feed from a suspected limp wrist. Now it's getting 2 or 3 light primer strikes per mag. About 200 rounds ago I took my leupold red dot off to swap back to iron sights. Btw if anyone is curious, the stock m&p slot and mount fit fine on the SD slide from my experience so far. No wiggle and it didn't move for 1000+ rounds no adjusting, just torqued to leupold manual spec. Anyway back on track.

Could it be the firing pin spring going soft? I'm taking the slide apart when I have a minute (Yay house remodeling) to make sure it's not just crud but I don't think it's that. It feels too sudden. Last time I went shooting I shot maybe 100 rounds and had two light strikes that didn't fire the round. Didn't shoot for about 5 months and now it's 2 or 3 light strikes per 10 Rd mag. I have another slide that I'm carving with my dremel that I might salvage a spring from if that's it but I don't want to cannibalize my project slide to make the stock one work. I'll midway or Brownell some parts. Probably going to take it apart tonight. PhotoGrid_1546219403861~01~01~01.png

If the pic thingy worked, that's my "custom" dremel tastic slide. Not even close to finished but when it is I still need to make a bench fire rig for it to make sure it's safe to shoot. If anyone can tell me how to calculate how thick the support pieces for the frame have to be that would be stellar. :-P
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Old December 30, 2018, 08:40 PM   #2
Felenari
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I do generally clean my firearm either day of of within a few days of shooting. Just field strip, nothing too epic.
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Old December 30, 2018, 09:18 PM   #3
4V50 Gary
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Clean the firing pin (striker) channel too. May need a new spring.
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Old December 30, 2018, 11:59 PM   #4
Felenari
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Working on that right now. Pretty gunky but not too bad. Gonna order a new spring anyway. Can't be that expensive right?
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Old December 31, 2018, 01:08 AM   #5
Felenari
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Found out what it was. There are two tiny white plastic thingies (technical term) that, when combined, form the captive stopper for the striker spring. One of the small nibs is missing. Had some very tiny brass flecks here and there, mostly under the extractor and close to the extractor so I'm guessing that's just normal collection from shooting. This is the first time I've dissembled this slide.
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Old January 1, 2019, 08:20 PM   #6
4V50 Gary
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Sounds like they need a more durable plastic
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Old January 1, 2019, 09:25 PM   #7
Felenari
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All the other pieces looked fine with almost no wear and tear. I took a closer look at the tip of the firing pin and there's a small half moon where the pin would hit the side of the firing pin hole and cause the striker to stop short or impart all of its energy into the slide before slipping to the side and ever so gently rapping the primer.

I have no idea how the little retainer piece made it out of the firearm in such a tight space.
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Old January 1, 2019, 11:29 PM   #8
mete
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Plastics ? lubes/solvents ?
Perhaps the plastic and the lubes are not compatible .
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Old January 1, 2019, 11:59 PM   #9
Felenari
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Just plain old rem oil and rem cleaners. The other part of the retainer looks fine. No melted edges or droopy form or anything. Just missing the one piece. Must've been a one in a million fluke.
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