I pulled firing pins on my 4013TSW,3913TSW and 3906.I took Qtip and cleaned.Was amazed as to how much primer brass was down in there.There was more in the 9s.How often do you suggest this area to be cleaned. Does the pin and sleeve it runs in need lubrication.I use Break Free to clean and protect Im sure some gets in to this area as it was wet but dirty in there as I have never cleaned.I appreciate your thoughts on this. Thanks Kenna

I usually clean the FP channel twice a year. Round count can vary but that's usually between 700 and 1000 rounds.

I like to keep the channel dry to avoid build up.

Next time you have the FP out of the slide take a look with a magnifier at the end. It should not have a sharp edge around the area that strikes the primer. If it does it can cut the primer and pull excessive brass back into the channel.

It can be smoothed very carefully with 600 or 1000 grit sand paper. You want to make sure you maintain the original shape, just break the sharp edge.

Dave

D Rock so drier is better? Thanks for the suggestion as to checking the firing pin for rough edges. Kenna

Yes to drier. Otherwise the oil attracts burnt powder/debris.

Dave

Also, sometimes the firing pin opening in the breech has sharp edges and shaves brass as the cases slide up on loading. The top side can be "slightly" chamfered to eliminate this shaving. The bits of brass can lead to misfires when it resticts the firing pin.

Both the firing pin and the opening should be clean and smooth--no sharp edges.