Hi Guys I'm new to the forum and was looking at some post on the modle 4006 resetting the decock/safety upon firing several rounds. Hopefully I have a spring to solve the problem coming from S&W. I am confused as the tech told me that this spring(manual safety plunger spring) is accessed from inside the slide by moving the bolt forward.
This completely mystifies me as the schematic I have doesn't show a spring origination from this area, but two springs accessed by removing the rear sight.
Any Ideas?
Mike G
Is
your 4006 spontaneously "decocking" itself when being fired?
If so, the ambi lever plunger spring might have been mixed up with the manual safety body plunger spring ... and the incorrect/too-light spring being in the manual safety body is insufficient to prevent the manual safety from rotating when the slide slams to the rear under recoil.
If
your 4006 doesn't exhibit this issue, are you just concerned that it might? (Don't mix up the springs
)
Anyway, the ambi lever plunger and spring are easily accessed by pushing in on the plunger (through hole in center of ambi lever) and pushing the ambi lever forward (capturing the plunger & spring, while wearing safety glasses, as sometimes they launch
). A 1/16" pin punch works, but so does a partially straightened paperclip.
The manual safety body plunger is more difficult to access, as it requires removing the manual safety from the slide. Not really difficult if you have the tools knowledge (a couple of pin punches small enough to depress the firing pin safety plunger and the firing pin, and then the firing pin a littler further, while manipulating the manual safety body out the left side of the slide (at which time the body plunger & spring may fly free
).
The
other 2 springs located under the rear sight base are for the nylon & steel plungers in the rear of the slide (firing pin safety lever & ejector depressor plunger). Yes, in older guns they may have become contaminated by congealed oil. The only way to remove
those plungers and springs is to remove the rear sight base, and inattention during reinstallation of the sight base may result in unintentional damage to one or both springs.
I think I've already mentioned in the other linked thread how an older style ambi lever plunger may get mixed up with the body plunger in a 9/.40 slide, and that can make for rough decocking, but I've personally only encountered it once in an early production 5903. It required removing the manual safety and replacing the plunger with the proper round-headed plunger. The old style lever plunger and the body plunger were both shouldered, and it was easy to miss the difference of the lever plunger having a flat spot on the head (versus the round head of the body plunger).
I'm sending you a PM, BTW.
