I found a Olympic Arms Pre-ban CAR-AR lower reciever and on the left side above the serial # there is a octagon with SGW inside it, anyone know what that stands for?  

Olympic Arms was started as Schuetzen Gun Works (SGW), established in 1956 in Colorado Springs, CO primarily as a barrel manufacturer. The owner learned his trade from his first business partner the famous P.O. Ackley, and continued many of Ackley's work ethics and quality standards in the new enterprise. The company moved to Olympia, WA in 1975, and proceeded to manufacture barrels and related parts under the SGW name.

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Thanks, your a helluva guy---I have looked all over and couldn't find any info at all

Next time try the OLY web site.
[url]http://www.olyarms.com/history.html[/url]