here's an album of build pics and reference this post for the magwell modifications, and this post for the mag modifications. The .40 mags will still lock in place but wobble around.
Last edited by waz0wski; 11-24-2019 at 02:54 PM.
If I may ask a few more questions - What recoil spring did you go with, and what ammo has run the best in it so far?
The USP45 frame needs no work to take an HK45 mag, and HK45 mags are very loose side-to-side in a USP45 frame since they're based off the narrower USP45C magazine profile.
lifesizepotato in this thread, and the info about using HK45 mags, jetfunnel, slide work on a .40 was from @jasonheimerm in this thread and @scubadds in this thread - additionally there were some earlier 10mm conversions I saw referenced with more custom work done by @BIG_CHRIS_304 here and @Pinion327 here
And of course, big thanks to @hk21man for making the barrels, and @chune for helping organize this thing
magwell and magazine modifications
I'm using an 18lb wolff spring - I also have 16/14lb springs, and I'm going to test those out next time I'm at the range, since I've had a few failures to feed that might be action/cycling related (or just me limp-wristing!)
The primary ammo I've been running is Sig Elite 180gr FMJ, since I picked up a bunch when Brownells had a good deal on it earlier this year. I've also tested lower power remington umc 180gr fmj and a variety of higher power underwood 10mm, ranging from 140-200gr FMJ, JHP, and XTP - will be trying to 200gr hard cast soon
Initially rounds would nose-up, I had to tweak mag feed lips, closed up the front slightly to get reliable feeding - with that done, FMJ has all fed well, but I've had a few issues with the XTP JHP getting stuck nose-down. Small COAL difference, not sure yet what's going on.
this post by @scubadds
I'd like to do another conversion with a .45 host, match-styled build with one of these aftermarket .45 barrels. maybe next year...
Last edited by waz0wski; 11-24-2019 at 02:58 PM. Reason: update links
Thanks for the shout out, waz0wski. I haven't logged on here for a few years, but it's great to see people like yourself pushing that 10mm USP envelope.
Just an FYI for anyone still looking at this. I contacted Mike at Michael's Machines, as instructed in an earlier post. We talked, I emailed, he replied, and I purchased. He sent the barrel right away (over 2 or 3 days) and I have it. He says that he has quite a few left of .40 and .45. I have not tried it yet, but I am excited to do so, but the take-away is you can also still get one! I bought a .45 conversion, but I am also considering a .40 next as I am intrigued by the HK45 magwell conversion.
Thanks to Mike and all the rest of you for your knowledge and experience.