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G60
07-18-2010, 4:32 PM
These primers are from a brand new smith & wesson m&p 9. Put about 400 rounds through it yesterday and noticed markings on the primers I'm not used to (the only other handguns I've owned were in .45)
hopefully it shows up in the pictures, but all the primers have the firing pink mark with a 'teardrop' shaped bulge around it.
My first guess is the bulge is due to higher pressure of the 9mm cartridge (even though these were mild 115gr loads), the firing pin hole being larger than the firing pin, and the teardrop shape being formed as the cartridge is quickly ejected.
Is this normal for an m&p9 or something to worry about?
http://c0013429.cdn1.cloudfiles.rackspacecloud.com/x2_2000f23

Shenaniguns
07-18-2010, 4:37 PM
Normal

gef
07-18-2010, 4:45 PM
I have the Smith M&P in 9mm and that's the way it is. I like mine alot.

OneSevenDeuce
07-18-2010, 5:12 PM
Interesting. You learn something every day.

45R
07-18-2010, 6:41 PM
Dude your gun is FUBAR send it to me and I'll make sure you get it back in proper working order :)

Its normal, enjoy shooting it!

smarter
07-18-2010, 8:06 PM
ditto to all above post.

evolixsurf
07-18-2010, 8:47 PM
yup, the m&p's all leave those markings.