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Brass shavings in a semiauto...
fastcarsgofast
Member Posts: 7,179
I took in a S&W SW40VE on trade a while back. I haven't shot it yet, but did tear it down for a thorough cleaning since it was dripping with oil from the previous owner. What I found other than oil was brass shavings in utterly every orafacice of the slide assembly.
I've been told it could be from an over pressure issue or an untuned extractor. I was wondering what the friendly neighborhood experts thought about it.
I've been told it could be from an over pressure issue or an untuned extractor. I was wondering what the friendly neighborhood experts thought about it.
Comments
Assuming you've inspected the gun properly and it otherwise looks OK to shoot, one simple way to help find the culprit is just to load the gun, cycle a few shells through it by working the action (KEEPING MUZZLE POINTED IN A SAFE DIRECTION WHEN YOU DO THIS), then inspect the cases carefully to see where (if anywhere) brass is being scratched/shaved off.
If you're having trouble seeing it, or your cases aren't clean, you could mark them up with a sharpie marker first to help emphasize the location of brass scratching.
I field stripped the gun and placed a round in the slide as if it were in battery. The extractor was digging into the side of the case, not just grabbing the rim. I filed a little off and function tested it. All seems well for now.
Thanks again.
Use a black marking pen to paint a few cartridges.
cycle them to determine what needs to be deburred/polished.
You don't want to disable that extractor by indiscriminate filing.
Also look at the bottom forward slide edge.