The Guntec USA BAR-5.5 5.5" 5.56mm barrel offers unparalleled performance and durability in a compact package. Precision-engineered from premium 4150 Chromoly steel, this barrel is designed for serious shooters seeking reliability and accuracy. Its lightweight contour enhances mobility while maintaining structural integrity, making it ideal for dynamic shooting environments. 1:5 twist rate for improved bullet stabilization 1/2 by 28 threaded for compatibility with various muzzle devices Black nitride coating for enhanced corrosion resistance M4 feed ramps for reliable cycling Upgrade your firearm with the Guntec USA BAR-5.5 for maximum efficiency and performance.