Just curious - Model 642 throat

[Peter_S]

I'm somewhat new to revolvers and recently purchased this Airweight for my CC. I notice a slight narrowing at the chamber throat when I push a patch through which I understand is normal. But I also see what looks like some kind of insert right at the throat.

Hopefully the images post properly. There is a "knurled" section and then a different type of material from the knurling to the chamber exit.

Like I said...I'm just curious about why this exists...or if it doesn't really exist then I need to clean the chamber a whole lot better...

 

[kenjen]

i think what you are seeing is erosion from the shell being fired, it is common in all revolers.

 

[MichiganScott]

Definitely not normal erosion. Those are chatter marks. The chamber shoulder was either cut with a dull reamer or not fully finished. You will get a totally unacceptable amount of fouling.

If the gun is new, it's due for a trip back to S&W.

 

[Peter_S]

Definitely not normal erosion. Those are chatter marks. The chamber shoulder was either cut with a dull reamer or not fully finished. You will get a totally unacceptable amount of fouling.

If the gun is new, it's due for a trip back to S&W.

really? Yes, its just a few months old - 200 to 300 rounds max through it.