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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
[#1]
Link Posted: 7/26/2002 9:17:05 PM EDT
[#2]

Quoted:

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 9:26:01 PM EDT
[#3]
Link Posted: 7/26/2002 9:37:45 PM EDT
[#4]
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 9:56:18 PM EDT
[#5]
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