Enhance your firearm's performance with the Guntec USA BAR-5.5-TIN-HP 5.5" barrel, expertly designed for high-precision shooting. Manufactured from durable 4150 Chromoly Steel, this barrel is chambered for 5.56/.223, ensuring unmatched reliability and firing accuracy. The high polish tin coating not only adds aesthetic appeal but also boosts its resilience against wear and corrosion. 4150 Chromoly Steel construction Chambered for 5.56x45/.223 1/2 by 28 thread 1:5 twist rate for improved accuracy M4 feed ramps for reliable feeding Custom short gas tube included Micro pistol length gas system Spiral engraved markings near the break Elevate your shooting experience with this precision-crafted barrel for remarkable results.