So.  Mikes machines is finally starting.   I would hope to have it in a few weeks.  HK parts had sent the wrong flat. 


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thanks for the info
It didn't sound correct when I was speed typing, but couldn't think of the correct terms...
I compared it to the USP .45 when did the work.
I did as little as possible  and bit by bit...
I need to gather up some shot brass and inspect things.....

update:

So, I gently bent the feed lips in a small amount to mimic the .40 lips.

I polished the feed ramp area and gave it more "free bore" not sure if that's the correct term; but the longer rounds needed a bit of room to feed reliably....

My only test was 3-4 extremely fast shots with Hornady self defense ammo (shooting at a running deer from a stand)

It cycled great.

So, at this point;
It uses stock mag, last round hold open works; loaded ammo ejects by hand cycling;
It pretty much is as good as a stock USP .45 or .40 should operate...
I will get a video up asap

Took my 10 year old deer hunting at his request...
He was shooting a 300 blackout, he usually is a great shot on the range; but he had a tough downward angle...
So his first shot hit low, and the deer jumped up and ran;
In the moment I thought he hit it and it was running off;
So, I got 3-4 fast shots off with the 10mm USP at it darted into the woods.

The good news is the gun performed flawlessly; the other good news is I missed also.... (really wasn't that excited about cleaning a deer that night)

I just finished polishing the feed ramp and had not fully tested the gun; nor had I tested the hunting rounds I shot;

I was impressed the gun cycled very well; funny thing is I don't even remember any recall at all....
Just had to share

Thanks
I will check them out. 
I assume they are not plated?

Looking to get bulk pack of something versatile but seems nice to go ahead with some type of hollow point.
Between the cheaper Winchester 180 jhp or 180 golden sabers
Do you guys recommend one over the other?
Would be shooting out of HK USP 10mm, sig 229 and HkMP5 10mm

Try mark at L&M precision

I have pics but they are too large to upload. I will workj on it tomorrow

yes
I opened the ejection port

If this feeds better (I had a few hickups feeding at the 3rd range test) then this is pretty much a 100% functioning all HK (except Barrel and spring) gun

It should be identical to shooting it in .40 or .45;

Not sure how I was the first to come up with this idea and test it; but it seems to work fine

I did have once that the hammer did not stay back (but I am sure that can be rectified with spring swap if needed)

I have not seen anyone attempt a 10mm USP the way I did this one.

I bought a .40 EFK barrel, I reamed it to 10mm and polished barrel feed ramps etc.- as has been done
I put in the 18lb recoil spring too.
Took the .40 slide assembly and put it on a USP .45 frame.
I used the USP .45 mags which feed 10mm fine after I adjusted the feed lips
So the slide lock functions perfectly.
I opened up the ejection port, so it no ejects live rounds as normal

I had some feeding issues as the EFK barrel had abrupt/sharp edges; but I believe I have worked thru them
The .45 frame is about 2-3mm longer at the barrel end, but isn't noticable; and after I test fire again and validate function; I will sell the .40 frame off;
Buy a .45 USP and sell that slide off....
Pics to be added shortly




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I have a nice MP5 .40 LE trade in Kit inbound.
Bought a .40 flat, high impulse locking piece and rail.
Getting Michaels Machine to build it as the 10mm MP5 is tricky...
Went ahead and got 10 mags to go with it....
I got start loading some 10mm

Had one and sold it; regret it
It shot fine;

I bought a 9mm and was going to just get a conversion for the 10mm; but they are out of stock now....


I think the Witness line had more problems than the stock 3.....
Most dealers are not that familiar with the stock 3 etc

So I am midstream on my conversion (I posted under gunsmithing)

I bought a .40 EFK threaded barrel, bought a Manson reamer, and no-go gauge.
18# spring, jet funnel kit, and 2 STI mags...
I can't stand the thought of not having slide stay open after the last round....

So, I put the the .40 slide on my .45 frame; fits nicely except frame is 3 mm longer on the muzzle end...fired fine,except some rounds went over the chamber and locked the slide...
Now I just need to ream the barrel tonight or tomorrow

Then bend the .45 feed lips to fit 10mm;

thanks
Had not even thought about that....

I saw feed lip tools at Brownells, but was moving slowly on it

I just got my ream in, so I will tackle feeding the 10mm next

So I bought a .40 usp and .40 barrel, and ream kit to make the 10mm barrel

Bought the 18lb spring and sti mags as has been previously done (YouTube video by hotpotato)
But I don't like the idea of the slide not staying open on last round
So I swapped the .40 slide onto the .45 usp frame and it actually fit
There is a few mm's of frame extending forward. But that is not a deal breaker
It shot that way, except a few rounds nosed up over the barrel and made a 3/4 stovepipe

Do you wizards think it possible to bend the feed lips On the .45 mag to lower the angle of entry into The barrel?
The usp .45 mags are solid metal and boxed in on the rear corners
Not sure if I would need to put relief cuts to change geometry?
My crazy idea is to take the metal insert out of a usp .40 mag
And sleeve it into the .45 mag. Then use the .40 follower
It does lock the slide back with the .40 follower now while fitting it into the .45 mag.