.40sw reamed to 10mm

[Ryan Guthrie]

Needing some help locating a gunsmith with a 10mm reamer to convert a .40sw barrel to 10mm casing. Can anyone give me some contact information to try to find someone to do this for an H&K USP 40? From what I understand the factory barrel is difficult to ream due to H&K's treatment, but aftermarket barrels aren't easy to come by. A carbide or tungsten reamer I would think would suffice, but not sure. Any advice or information, please let me know because this is really my only speed bump in this conversion. Thanks

 

[JimP42]

Is a .40 barrel rated for 10mm pressures?


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[Ryan Guthrie]

From what I understand this conversion works very well with this barrel and other .40 aftermarket barrels.

 

[Ryan Guthrie]

Recoil spring also changed obviously, other than that and an STI mag change, we're good to go.

 

[Slacker]

https://m.facebook.com/Cylinderhone-756429174391912/

This guy reamed my Cz barrel.
I'd use him again. He is in Raleigh.

 

[Ryan Guthrie]

Thank you sir, I'll reach out to him later today.

 

[J R Green]

What about the OAL of the bullets. Will they even fit in the magazine?

 

[Ryan Guthrie]

What about the OAL of the bullets. Will they even fit in the magazine?

Magazines have to be changed to either 126mm STI mag with mag release notch made, or an HK45 with a feed lip modification.