m&p weird barrel shape

[srice425]

this may be a stupid question, but on my full size m&p 9mm, when i took the barrel out to clean, i found that the barrel is raised a bit in a complete circle about an inch from the end of the barrel. all the way around. is it supposed to be smooth all the way from front to back or is this swell normal? i thought it mayy be normal since it was a consistent swell all the way around. it is very slight but can be felt by running your finger up and down the barrel.

 

[BIGMAC116]

Question: does the slide still move freely in an out of battery? Also, did you notice anything strange last range time? ie a round fired weird/ a "dud" round/ did you fore reloads/ anything out of the ordinary?

 

[srice425]

today was the first range trip and i had no issues besides accuracy and im not sure how much was the weapon and how much was me not being used to the new pistol.

 

[BIGMAC116]

I have a full size M&P40 (duty weapon) and a 9c. No weird protrusions on either of them. Not sure what to tell you. Defect perhaps?

 

[danysw]

My SR9c and my new FS9 have the same "bulge" like half inch long all around at the end of the barrel

 

[Pisgah]

The Browning recoil system (which most modern-day semiautos have in one form or another) requires that the barrel be supported at the front and rear. A few still use a barrel bushing at the front end to accomplish this, like the 1911, but most now use a "bulge" at the front of the barrel. This bulge allows the front of the barrel to be supported within the slide, and assures the barrel returns to the same position after each shot.

 

[srice425]

thank you.

 

[MP22]

Hmmm...weird indeed. My M&P is not like that.

 

[Nakanokalronin]

Completely normal and is the same on many other semi-autos.

 

[gregm784]

Like this. It's normal. It is used to register the barrel in the slide housing


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