AR Sponsor
Posted: 2/1/2013 1:02:24 PM EDT
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Hey guys I have a barrel that has
SUM 5.56 Stamped in it. Just curious if anyone knows who makes it? Thanks |
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OLY, "These barrels are our most accurate barrels, and quite frankly, these are the most accurate AR-15 barrels on the market. These barrels have Broach-cut Rifling. What is that you say? Well, broaching is the method used to create the lands and grooves. For these barrels, we use the stamping "SUM" which means Stainless Ultra Match. SUM barrels are all chambered with minimum SAAMI 223 Remington reamers. These barrels can also be identified by looking down the bore. All of our broach-cut or Ultramatch barrels have only 4 lands and 4 grooves." |
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