Quote:
Originally Posted by Dan5809
. I also noticed a green sludge build up in the striker ports and safety ports on the slide. It appears this sludge (varnish) interfered with the operations of the gun.
The Sigma 40F and 40VE were finally phased out of service. Due to age the polymer frames began cracking. They were replaced by the M&P40 which has proven to be a fine gun.
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I've got a 40F, from the year S&W introduced the model. With
the engagement surfaces in trigger and safety smoothed up, it's not a bad trigger by any measure. The breech face did tend to shave primers, and the shavings tended to migrate
from striker channel into the striker safety bore, limiting
movement of the plunger and eventually giving me light-
strikes. I wonder if the green sludge you observed might
have been oxidized primer shavings...?
Regarding the frame cracking--nylon (Zytel) becomes
progressively embrittled as humidity drops. Don't hold me
to it, but I'll guess it's below 50% RH, that embrittlement
begins, and progresses as dryness increases. Was your
agency in a dry area?