Quality, stainless steel gas tubes in extended lengths. In the right circumstances there are benefits to be realized by lengthening the gas system on long barreled high-performance AR-15 rifles. Brass life, reliability, and accuracy can all benefit from the correct relationship between barrel length, case capacity, and gas system length. For your custom performance build White Oak Armament offer quality gas tubes in lengths longer than traditional rifle length. For best results consult with a competent gunsmith to determine the optimum gas system length for your build. Lengths White Oak Custom +1" (one inch longer than rifle length - 16.160") White Oak Ma Mfg: White Oak Armament