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Posted: 7/26/2002 9:04:20 PM EDT
My buddy picked up an upper last weekend at a show. It had a GI surplus upper receiver. It also had a new CAR type 16" barrel marked 556 SUM. No other markings. Does the SUM stand for Stainless Ultra Match? Does anyone have information on a barrel marked SUM? Twist rate? Any ideas or information would be appreciated.
Link Posted: 7/26/2002 9:08:06 PM EDT
Link Posted: 7/26/2002 9:17:05 PM EDT

Originally Posted By thebeekeeper1:

You might try contacting Tom Spithaler for assistance. He is quite helpful.

Made me laugh so hard my owce cream sammich came out my nose. THAT HURT!!!!


Link Posted: 7/26/2002 9:26:01 PM EDT
Link Posted: 7/26/2002 9:37:45 PM EDT
I asked a simple question (I thought politely) to the general Ar15.com population. He crawled me about sending $25 to OlyArms to get the history of my rifle, even though my serial number is in the "records destroyed in the fire" range. Just asked simply this: "How can I guage the twist rate of my barrel?"


Link Posted: 7/26/2002 9:56:18 PM EDT
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