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Feed Ramp/chamber/bolt Pic Request?


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#1 Gloftoe

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Posted 11 March 2005 - 03:12 PM

...of their Thompson's feed ramp/chamber/bolt area? I'm currently building an AR15 in 45ACP caliber, using Thompson SMG mags. I'm having troubles getting the rounds to feed correctly (they keep nosing up, and missing the chamber). I was hoping to get some ideas from how the Thompson feeds. Basically I'm looking for pics of the round's track from the magazine, INTO the chamber, and also how the bolt inteacts with the round when stripping it from the magazine.

ANY and ALL help anyone can give would be greatly appreciated. Thanks very much in advance! smile.gif
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#2 Gloftoe

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Posted 12 March 2005 - 02:13 AM

The Colt-style 9mm AR15s (which I'm basing the build on) use double-stacked Uzi mags (feeding alternately from the left and right) and standard AR15 mags also alternately feed from the left and right. I'm constructing a custom mag block to work with the Thompson mags (much like the Colt style 9mm one), that includes a separate feed ramp leading up to the chamber (much like the colt 9mm one). So double-stacked mags work just fine. The magazine on a Colt style 9mm AR is positioned mid-magwell, hence the feed ramp that is included on the mag block.

This is why I asked for PICTURES of the "bullet track" on a Thompson SMG. Thanks for the input, though.

Could anyone who owns a Thompson SMG provide these types of pics? I'd be most appreciative. Thanks again in advance! smile.gif

Edit: Greasegun mags are far too wide to fit in an AR15 lower (the Thompson mags are too wide also, but still not as wide as Greasegun mags). I have modified the magazine well by milling out enough clearance to accept a Thompson mag, but the Greasegun mags would require me to mill out even MORE of the mag well, resulting in paper-thin mag well walls.

Edited by Gloftoe, 12 March 2005 - 02:15 AM.

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#3 Nineteenhundred

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Posted 12 March 2005 - 11:01 AM

IMA sells thompson "nose" demills. They call them receiver fronts. Follow this if it works, otherwise go to their site and search Thompson.

http://www.ima-usa.c...n_description=1

Edited by Nineteenhundred, 12 March 2005 - 11:02 AM.

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#4 Gloftoe

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Posted 12 March 2005 - 01:55 PM

QUOTE (Nineteenhundred @ Mar 12 2005, 11:01 AM)
IMA sells thompson "nose" demills. They call them receiver fronts. Follow this if it works, otherwise go to their site and search Thompson.

http://www.ima-usa.c...n_description=1

No pics of them are available on that site, unless I just couldn't find the pics. I found the entry to purchase the item, but not a picture of it.
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#5 PK.

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Posted 12 March 2005 - 05:52 PM

Just buy one from them, better than any picture.
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#6 Grey Crow

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Posted 12 March 2005 - 07:10 PM

I would think that one would need fairly precise measurements to make it work if its at all doable.
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