oinco Posted April 26, 2015 Share Posted April 26, 2015 Hello, I didn't find anything via search about anyone running a converted full size USP in 10mm, and was hoping to hear of experiences good/bad/otherwise. I have read about/talked to a few gents that have done it, but that was awhile ago, and it seems that the interest in 10mm is seeing a bit of a swell again? I have a full size .40 with the original and a T barrel to be converted, jet funnel (STI and Para mags fit nicely?), will mill the slide to be able to clear a loaded round, and 16/18lb recoil springs to try...am I missing something? I (may?) understand the difficulties with the hardened chamber - the machining will not be done with a reamer for that reason. Thanks in advance! Link to comment Share on other sites More sharing options...
Trader Posted April 26, 2015 Share Posted April 26, 2015 A .40 will not do for a 10mm conversion. Magazine and magwell are too short for 10mm. .45 USP will be needed if anyone makes a conversion barrel. Link to comment Share on other sites More sharing options...
jmbaccolyte Posted April 26, 2015 Share Posted April 26, 2015 (edited) If you use a 45 USP, then the magazine well will be long enough, but the magazine feed lips will probably be too wide and the breech face on the slide will be too big. Sounds like one of my projects- no offense intended. PS: I carried a USP compact in .40 for a few years and really liked it. Edited April 26, 2015 by jmbaccolyte Link to comment Share on other sites More sharing options...
oinco Posted April 26, 2015 Author Share Posted April 26, 2015 Thanks for the replies! I had to go and double check myself just now, but STI 10mm mags fit in the .40FS frame (upper/etc. is in pre-op across the country), strangely one fits nicer than the other and both are NIW? I struggled to find the two mags I have, and had to order them from two different suppliers as I was scrambling to get these right before CO mandated that 15rd mags are all I can purchase here. I know nothing about STI's, much less if there are mag dimension differences based on production/etc./etc.? I double checked the Para 16-40 mag also, and it is just a bit looser fit in the .40 USP frame. I looked long and hard for a conversion barrel to fit my Expert 45, only thing I could find was a .400 Corbon barrel that was all cobbled up with a DIY magnaport job, and lots of "no's" from the usual sources of barrels for these things. Oh well, so it goes. Link to comment Share on other sites More sharing options...
scubadds Posted July 25, 2017 Share Posted July 25, 2017 I have one I put the .40 slide on the ,45 frame... Just need to tweak the mags a bit more to get reliable feeding.... Link to comment Share on other sites More sharing options...
HalfBastard Posted July 27, 2017 Share Posted July 27, 2017 LifeSizePotato on YouTube has one with what I believe is a reamed out .40 barrel. I also think he used slightly modified STI magazines to feed it. Link to comment Share on other sites More sharing options...
OrondoShooter Posted February 13, 2018 Share Posted February 13, 2018 What half bastard said!! LifeSizePotato on YouTube. I've been dancing with doing the 10mm conversion, just haven't comitted yet. Link to comment Share on other sites More sharing options...
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