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1/25/2018 7:38:29 AM
Posted: 7/26/2002 8:04:20 PM EST
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 8:08:06 PM EST
Link Posted: 7/26/2002 8:17:05 PM EST

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!!!!

Scott

Link Posted: 7/26/2002 8:26:01 PM EST
Link Posted: 7/26/2002 8:37:45 PM EST
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?"

Scott

Link Posted: 7/26/2002 8:56:18 PM EST
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