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San Tan Tactical Barrels™ AR15 SOCOM Profile Barrels, Currently available in 7.5", 10.5" 16” lengths, .223 WYLDE, 1:7 Twist, 41V50, CrMoV was designed to be the perfect addition to any new or current rifle build. The San Tan Tactical SOCOM Profile barrel is not too light and not too heavy making it perfect for modern rifle builds. STT's AR15 barrels are made from 4150 Chrome Moly Vanadium, coated in H&M Blacknitride+™ for increased wear resistance, chambered in .223 Wylde so that you can feed it both .223 and 5.56 NATO ammo. STT incorporated input received from military, law enforcement and civilian shooters into the engineering of their AR15 barrels to accommodate modern-day shooting requirements. Every barrel is precision, instrument-inspected for absolute straightness and air gauged for maximum uniformity, yielding the highest accuracy possible. Land and groove tolerance from breech to muzzle can vary only .0001" for the best concentricity. When using factory loaded, SAAMI approved, Match Grade ammunition you can expect 1 MOA level accuracy (or better) out of STT barrels at 100 yards. Keep in mind that headspace, component selection, assembly methods, external variables such as the shooter, environmental conditions and ammunition will all have an impact on group sizes. STT only recommends that you use factory new SAAMI approved ammunition in STT barrels. STT stands behind their barrels performing 1 MOA (or better) when Match Grade ammo is used.