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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 10/2/2005 5:37:49 PM EDT
I just traded for another AR upper. I was told that this is a factory Bushmaster target upper. 20 in. heavy stainless barrel, flat-top reciever, free-float tube etc. However, my barrel is marked "SUM 5.56", which leads me to believe this is actually an Olympic barrel, the whole thing has a really slick black finish, almost like teflon moly, but harder. Any idea what the hell it actually is? Even as an Oly, it's easily worth more than I have in it. I'm also trying to determine the twist rate, I tried the tight fitting patch on the cleaning rod trick, but my jag keeps unscrewing. Of course the barrels not marked with this information. I think this must be an oldie.

Link Posted: 10/2/2005 5:47:31 PM EDT
Try pulling your cleaning rod through the barrel rather than pushing. This will keep the rod from unthreading.
Link Posted: 10/2/2005 5:50:08 PM EDT
Link Posted: 10/2/2005 6:26:25 PM EDT
Olympic SUM 5.56 barrel? The common twist rate is 1:10...
Link Posted: 10/2/2005 9:00:26 PM EDT
Link Posted: 10/2/2005 9:07:07 PM EDT

Originally Posted By David_Hineline:
But if he pulls the cleaning rod instead of pushing then wouldn't he have to count backwards?

Only South of the Equator.

Link Posted: 10/3/2005 7:04:03 AM EDT
The barrel is an Oly barrel. Definitely not Bushmaster.
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