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Posted: 11/19/2009 6:49:31 AM EDT
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I'm trying to figure out who made my flat top upper. It has the key hole forge mark (Cerro Forge), T-marks in white, and M4 over the gas tube hole. No other marks that I can see. I tried to do a search on this subject, but could only come up with the Cerro Forge info. Would really like to know which company sold this. Thanks in advance for your help. Ham
ETA: Post 100 and it only took 5 years 
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