The Tiger Rock Inc. BR168-P AR-15 16" 5.56 NATO rifle barrel is crafted for precision and reliability, making it a top choice for enthusiasts. Engineered from 4140 gun quality steel with a parkerized finish, this barrel offers exceptional durability and performance across various shooting applications. Length: 16" 5.56 NATO caliber 1:8 Twist rate for versatility .750" gas block diameter for optimal gas flow Carbine gas system with a 0.07 gas hole diameter 1/2"x28 Thread Pitch Heat-treated to RC 28-32 hardness, stress relieved for longevity Parkerized finish for corrosion resistance Made in the U.S.A., ensuring high manufacturing standards Compatible with AR-15 platforms Elevate your shooting performance with the Tiger Rock rifle barrel, designed to meet rigorous demands.