9mm Breech Face

[ogiebb]

picked up an STI 9mm slide and measured the breech face width as .435.. isn't this too wide?

im wondering if I can still use this..

[Brazos Custom]

Sounds like it is a 40 and not a 9mm. I would return it.

[ogiebb]

Sounds like it is a 40 and not a 9mm. I would return it.

Thanks Bob ill send it back

[kimberacp]

no...wait. I have a Kimber 9mm and although I dont recall the measurment, I could fit a 40 case into the breechface. Now saying that, the bottom where the round slides up, the area next to the extractor, will not let a 40 case slide up, only a 9mm case, which I do remember is .357 or something like that.

If you look here on the forum, you will find others that have mentioned that Kimber used the same breechface size for both 40 and 9. And while I am not a gunsmith, it seems to me that if only the bottom is tighter to only let a 9mm case up into the breechface and the gun works...no problem, right? Because my gun shoot 9mm alright!

So, by opening up that area to allow a 40 case up into the breechface, a 9mm gun can be made to shoot 40sw.

IMO

[Scott Steele]

picked up an STI 9mm slide and measured the breech face width as .435.. isn't this too wide?

im wondering if I can still use this..

Same thing happened to me. STI must have packaged it wrong.