2ndArmored Posted June 7, 2014 Report Share Posted June 7, 2014 Does anybody have one for sale, or is willing to send me the specs on theirs? I've gone to 3 good gunsmiths trying to convert the plentiful .45 ACP stick into the virtually non existant 10mm variety. None of them could but of course opined that "someone" ought to be able to. Yet no one can seem to. I was told that the two calibers are so similar that you can just use the .45 mag on 'em. Turns out not to be so. (If it were, why would AO have produced specially-marked (and presumably specially-made) magazines?) The Ultimate Thompson book didn't help. Doug Richardson couldn't help. Starting to think it'd be easier to construct a time machine and go back to the '80's to buy some. Any assistance from the membership would be appreciated. Link to comment Share on other sites More sharing options...
StooperZero Posted June 7, 2014 Report Share Posted June 7, 2014 IMHO increase the hump size on the follower and increase lip size. or build a time machine. Link to comment Share on other sites More sharing options...
2ndArmored Posted June 10, 2014 Author Report Share Posted June 10, 2014 http://media.globaltv.com/uploadedimages/content/community/blogs/blogal/2012/november/familyguy_2.jpg I've got some guys working on it.... Link to comment Share on other sites More sharing options...
dalbert Posted June 10, 2014 Report Share Posted June 10, 2014 I wonder if this might be a situation where a phone call to Numrich might prove fruitful. They built the 10mm TSMGs in the early 90's. (1992, IIIRC) David Albertdalbert@sturmgewehr.com Link to comment Share on other sites More sharing options...
2ndArmored Posted June 13, 2014 Author Report Share Posted June 13, 2014 I tried that - years ago and yesterday. The people who worked on the original are all gone (either from the company or this plane of existence) so the current employees can only read the website to me without any further insight. The part is still listed on the website (https://www.gunpartscorp.com/Products/501330.htm) but has been "out of stock" for at least 3 years (as far back as Numrich's computer files go.) Link to comment Share on other sites More sharing options...
deerslayer Posted June 18, 2014 Report Share Posted June 18, 2014 You could always add an adapter to an existing 10mm magazine. Have you tried a drum? I would think that might be the easier mag to adapt. Link to comment Share on other sites More sharing options...
2ndArmored Posted June 20, 2014 Author Report Share Posted June 20, 2014 (edited) I'd thought of that, but all the 10mm mag that are readily available are for handguns and the angle between the mag / grip and the barrel is not the 90 degree arrangement Col. Thompson chose. Feeding problems would be inevitable and unfixable. Edited June 20, 2014 by 2ndArmored Link to comment Share on other sites More sharing options...
deerslayer Posted June 22, 2014 Report Share Posted June 22, 2014 I'd be happy to try working up a magazine for you if you wish. Dan Link to comment Share on other sites More sharing options...
2ndArmored Posted June 24, 2014 Author Report Share Posted June 24, 2014 PM sent. Link to comment Share on other sites More sharing options...
Paladin601 Posted July 17, 2014 Report Share Posted July 17, 2014 (edited) wouldn't the bridge have to be longer for the 10 mm? Never mind the 45 acp is longer. my bad. Wouldn't it be easier to change the barrel to 45 acp? Edited July 17, 2014 by Paladin601 Link to comment Share on other sites More sharing options...
mnshooter Posted August 2, 2014 Report Share Posted August 2, 2014 wouldn't the bridge have to be longer for the 10 mm? Never mind the 45 acp is longer. my bad. Wouldn't it be easier to change the barrel to 45 acp?Good point. Unless you have a landfill of 10mm ammo, you won't save any money buying/reloading that cartridge. A bigger concern to me would be the much higher operating pressure of the 10mm cartridge, and how well the 12L14 steel of the Hurleys would stand up to this. Yes, Numrich/Hurley did make some 10mms, but you seldom see them accused of a superior product. Link to comment Share on other sites More sharing options...
Paladin601 Posted August 6, 2014 Report Share Posted August 6, 2014 I only remember seeing the 10 mm in magazines, no one ever had them here, that I found, on the left coast Link to comment Share on other sites More sharing options...
shifterkarter Posted February 22, 2015 Report Share Posted February 22, 2015 I bought a new 10mm 1927 A1 back in 1992 (it is still unfired). If anyone is interested, I can do a measurement comparison between the 10mm and 45 magazine. I am a retired machinist, and may look at the possibility of converting 45's to 10's if there is enough interest. ej Link to comment Share on other sites More sharing options...
2ndArmored Posted January 25, 2016 Author Report Share Posted January 25, 2016 Since your post showed up half a year after the previous one, I'd given up hope! (Hence my failure to check for replies for almost a year.) Thanks for keeping the dream/nightmare alive. Sending me the specs would be great. Selling me a mag (if you're amenable) would be better. Let me know. Link to comment Share on other sites More sharing options...
shifterkarter Posted November 13, 2017 Report Share Posted November 13, 2017 I haven't been back in a while either - sorry...anyway, just listed my 1927A1 10mm on armslist. Link to comment Share on other sites More sharing options...
deerslayer Posted November 14, 2017 Report Share Posted November 14, 2017 How do the magazines compare? Link to comment Share on other sites More sharing options...
shifterkarter Posted November 14, 2017 Report Share Posted November 14, 2017 I have not done a side by side comparison, but can post a pic if interested. ej Link to comment Share on other sites More sharing options...
deerslayer Posted November 16, 2017 Report Share Posted November 16, 2017 Yes. A good picture and even a width measurement would be useful. Link to comment Share on other sites More sharing options...
shifterkarter Posted November 16, 2017 Report Share Posted November 16, 2017 Will try and get some pics in the next day or so. I listed mine online for 3200 unfired - do you think I am in the ballpark? Have seen a wide range of values and opinions. ej Link to comment Share on other sites More sharing options...
shifterkarter Posted November 16, 2017 Report Share Posted November 16, 2017 Seems like about 5 minutes with a dremel tool will do the trick on a standard .45 stick mag. ej Link to comment Share on other sites More sharing options...
deerslayer Posted November 18, 2017 Report Share Posted November 18, 2017 Does the front of the magazine have the standard GI markings or does it appear like numrich made a completely new magazine. All the 30 round GI mags have some markings... no blank ones have ever been described in print. Link to comment Share on other sites More sharing options...
shifterkarter Posted November 19, 2017 Report Share Posted November 19, 2017 It is stamped... The Seymour Products Co. Seymour Conn. ej Link to comment Share on other sites More sharing options...
deerslayer Posted November 19, 2017 Report Share Posted November 19, 2017 Ahh there we have it. 10mm Thompson mags are GI .45 acp mags with possibly slight modifications to the feed lips as indicated by the pictures and "10mm" stamped into the floor plate. Link to comment Share on other sites More sharing options...
shifterkarter Posted November 19, 2017 Report Share Posted November 19, 2017 looks like there is also a slight grind to the follower arm Link to comment Share on other sites More sharing options...
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