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Page AR-15 » AR-15 / M-16 Retro Forum
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Posted: 6/20/2011 1:02:13 PM EDT
I'm trying to set right some 20 rounders that have had their floorplates swapped around.

Can anyone tell me if a Simmonds Precision Products 20 round mag should have the "UI" stamp on the front face of the body?
Link Posted: 6/20/2011 4:02:48 PM EDT
UI is Universal Industries so, I wouldn't think so.
Link Posted: 6/20/2011 4:27:54 PM EDT
The floorplate reads:

(Simmonds Logo) M16/M16A1 CAL 5.56 mm

If I'm understanding it correctly, there's a connection to Universal so I'm unsure about the UI stamp.

I know the Colt mags have it and Adventure Line mags do not.  I just want to make sure about the Simmonds.

The mags I'm sorting are completely scrambled.
Link Posted: 6/20/2011 5:07:50 PM EDT
Oops. Well, the one Simmonds I have has the UI logo on the body so... I'd say that's probably correct.

Link Posted: 6/20/2011 5:11:00 PM EDT
Mine does too.  

Possibly UI is the contractor and they can put any floorplate they want on the mag for the buyer; Colt's, Simmonds, etc..  I know that the tooling to make the mags was sold over the years to a few different companys.
Link Posted: 6/20/2011 5:17:25 PM EDT
Thanks guys.
Link Posted: 6/20/2011 5:58:36 PM EDT
IIRC, NHMTG is the producer of UI, Simmons, Adventureline and of course, Colt magazines. I think UI actually owned Simmons at some point. I can tell you that I had the chance to buy a dozen NIW NHMTG 20 rounders awhile back and they are GTG. There's a mag guide somewhere here in Arfcom that lays it all out really well. I may have some of this backwards or wrong of course, the CRS is getting to be like CRAFT. Do not buy Sanchez mags though.

ETA: alpharubicon has a magazine guide, but I saw one somewhere else as well. It might have been Okay and Simmons that were made by NHMTG - they were/are definitely the mfg for Colt magazines though.
Link Posted: 6/21/2011 3:58:33 PM EDT
I dug out my unmolested box of seven Simmonds 20 round mags dated 7/70. All seven of the mags have a small UI stamp on the front of the mag about 3/4" above the floorplate. Hope this helps.

Link Posted: 6/21/2011 6:39:09 PM EDT
Hi Larry- A box of new old stock Simmonds mags is the ultimate authority, IMO.   Thank you for posting that.
Link Posted: 6/22/2011 7:09:47 AM EDT
I have 2 Simmonds mags, both with UI.

I have 4 Colt mags, 2 pre 70, 2 post 70. One of the pre 70 mags has the UI on it.
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