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 Need a 40S&W barrel reamed to 10mm 
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As the title suggests, I'm looking into having a .40 S&W barrel chamber reamed to 10mm auto. This is a "hold my beer" kinda job. I've got a spare USP40 slide and barrel assembly, I'll be getting a frame for it, and I'd like to make the 10mm gun that HK should've made. It's been done before, more than once and more than one way, but the barrel work is the hardest part to source nowadays.

Literally.

I'm not sure which barrel will be used, but it will either be the factory HK barrel I already have, which has a reputation for being stupid hard, or an aftermarket nitrided barrel, which, by nature of the nitride process, will also be stupid hard.

Will also need a little bit of machining on the slide to open the ejection port a little and cerakoted afterwards, but that's actually the easy part.

Advice? Guy to call? Stop it before you blow your hand up?
Any leads would be appreciated.


Thu Jul 30, 2020 11:57 pm
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Pvanderzee wrote:
As the title suggests, I'm looking into having a .40 S&W barrel chamber reamed to 10mm auto. This is a "hold my beer" kinda job. I've got a spare USP40 slide and barrel assembly, I'll be getting a frame for it, and I'd like to make the 10mm gun that HK should've made. It's been done before, more than once and more than one way, but the barrel work is the hardest part to source nowadays.

Literally.

I'm not sure which barrel will be used, but it will either be the factory HK barrel I already have, which has a reputation for being stupid hard, or an aftermarket nitrided barrel, which, by nature of the nitride process, will also be stupid hard.

Will also need a little bit of machining on the slide to open the ejection port a little and cerakoted afterwards, but that's actually the easy part. Dreadi @ Blackhammer Arms would be your huckleberry for this part. Bit of a drive, but worth it. You might discuss your concept with him too

Advice? Guy to call? Stop it before you blow your hand up?
Any leads would be appreciated.

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Fri Jul 31, 2020 7:05 am
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Traut wrote:
Pvanderzee wrote:

Will also need a little bit of machining on the slide to open the ejection port a little and cerakoted afterwards, but that's actually the easy part. Dreadi @ Blackhammer Arms would be your huckleberry for this part. Bit of a drive, but worth it. You might discuss your concept with him too


The Hammer's on my short list for the slide work and paint job. I just need to get the barrel part figured out first. That's the critical portion of this whole experiment. Without a working 10mm barrel, the rest of the ordeal is moot. The slide work is borderline optional.


Fri Jul 31, 2020 3:53 pm
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I think the nitriding depth is .4mm or less, so if you were to shave material off the bore, you'd have to FNC treat the barrel again.

I would imagine it would also be notoriously difficult to machine a nitride-treated barrel.


Fri Jul 31, 2020 7:57 pm
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os2firefox wrote:
I think the nitriding depth is .4mm or less, so if you were to shave material off the bore, you'd have to FNC treat the barrel again.

I would imagine it would also be notoriously difficult to machine a nitride-treated barrel.

or micro slick the bare metal instead.

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Fri Jul 31, 2020 8:06 pm
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