STT’s AR15 barrels are made from 4150 Chrome Moly Vanadium, coated in H&M Blacknitride+™ for increased wear resistance, chambered 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.

STT AR15 barrels are then coated in H&M Blacknitride+™ or Ferritic Nitrocarburizing, resulting in significantly improved surface properties on ferrous metal parts while maintaining dimensional and shape stability. H&M Blacknitride+™ yields increased wear resistance, improved fatigue strength, better corrosion resistance, improved lubricity, and enhanced cosmetic appeal. 

Technical Specs:

• Barrel Length: 16.25″
• Barrel Profile: SOCOM
• Barrel Material: 4150 Chrome Moly Vanadium
• Barrel Type: Button Rifled
• Barrel Coating: H&M Blacknitride+™
• Barrel Caliber: 5.56mm
• Barrel Gas System: Mid Length
• Barrel Twist: 1:7
• Barrel Extension: M4 Type Feed Ramps
• Gas Block Diameter: .750″
• Gas Block Journal Length: 1.13″
• Muzzle Thread: 1/2-28 TPI
• Air Gauged
• Weight: 2.0 lbs