We know that Clot and FN do it.

How about the rest....
In no particular order.
If you can think of anymore let me know and I'll look them up.

DEFENSE PROCUREMENT MANUFACTURING SERVICES INC  
CAGE Code:  40554  
Status:  ACTIVE
Date CAGE Code Established: 5/23/1986
Last Updated: 7/19/2005

SGW INC  (Schuetzen Gun Works, aka Olympic Arms)
CAGE Code:  4S779
Status:  Active  
Date CAGE Code Established: 12/3/1983

BUSHMASTER FIREARMS INC  
CAGE Code:  7Z500  
Status:  Active  
Date CAGE Code Established: 2/2/1985
Last Updated: 4/4/2005

ARMALITE INC  
CAGE Code:  1PV46  
Status:  Active  
Date CAGE Code Established: 4/10/2000
Last Updated: 12/19/2005

LEWIS MACHINE & TOOL CO  
CAGE Code:  3W544  
Status:  Active
Date CAGE Code Established: 11/27/1982
Last Updated: 4/28/2005

MEGA MACHINE SHOP INC.  
CAGE Code:  3DS19  
Status: Active
Date CAGE Code Established: 2/22/2003
Last Updated: 12/14/2005

CMMG INC.  
CAGE Code:  3DUU1
Status: Active
Date CAGE Code Established: 2/25/2003
Last Updated: 1/27/2004

AMERICAN SPIRIT ARMS
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HESSE
VULCAN ARMS
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SPECIAL WEAPONS (AZ)
BOBCAT WEAPONS
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Keep in mind that having a CAGE code does not automatically make one a supplier, anyone can apply for a CAGE code and be listed. For some real interesting reading run a CAGE to P/N cross on FED-LOG and see what actual products they supply.

Quoted: Keep in mind that having a CAGE code does not automatically make one a supplier, anyone can apply for a CAGE code and be listed. For some real interesting reading run a CAGE to P/N cross on FED-LOG and see what actual products they supply.

If I had FEDLOG or HAYSTACK....
Having a CAGE does allow the supply system to use them as suppliers if need be.
I did it once before back before I retired and the results were pretty interesting.