Nevermind I finally found what I was looking for online.
"Lewis Machine & Tool
LMT
Lauer
DS Arms
PWA
Eagle
Armalite
Knights Armament
Barrett
Continental Machine Tool
Stag
Rock River Arms
High Standard
Noveske
Century (New)
Global Tactical
CLE
S&W
MGI
Wilson Tactical
Grenadier Precision
Colt
LAR Manufacturing
LAR
Bushmaster
Ameetec
DPMS
CMMG
Double Star
Fulton Armory
Spike's Tactical
JVP
Double Star
LRB
Mega Machine Shop
Mega
GSE
Dalphon
POF
Alexander Arms
Olympic
Olympic
SGW
Tromix
Palmetto
Dalphon
Frankford
Century (Old)
Sun Devil
Sun Devil forged billet receivers
Superior
Superior Arms
-------------------------------------
The above list contains the machine companies that machine the raw forgings into usable receivers. Each individual company applies their own finishing standards. "
http://www.ar15armory.com/forums/AR15-Receiver-t15231.html
"Lewis Machine & Tool
LMT
Lauer
DS Arms
PWA
Eagle
Armalite
Knights Armament
Barrett
Continental Machine Tool
Stag
Rock River Arms
High Standard
Noveske
Century (New)
Global Tactical
CLE
S&W
MGI
Wilson Tactical
Grenadier Precision
Colt
LAR Manufacturing
LAR
Bushmaster
Ameetec
DPMS
CMMG
Double Star
Fulton Armory
Spike's Tactical
JVP
Double Star
LRB
Mega Machine Shop
Mega
GSE
Dalphon
POF
Alexander Arms
Olympic
Olympic
SGW
Tromix
Palmetto
Dalphon
Frankford
Century (Old)
Sun Devil
Sun Devil forged billet receivers
Superior
Superior Arms
-------------------------------------
The above list contains the machine companies that machine the raw forgings into usable receivers. Each individual company applies their own finishing standards. "
http://www.ar15armory.com/forums/AR15-Receiver-t15231.html