FN presents the FN BBL AR15 5.56X45 20 Rifle Length Gas System, a testament to over a century of barrel manufacturing excellence. This barrel is crafted using FN's proprietary high-grade Chrome Moly Venadium steel, ensuring durability and accuracy. The cold hammer forging process, perfected by FN, results in a barrel capable of withstanding the rigors of sustained fully-automatic fire. Each barrel undergoes Magnetic Particle testing to guarantee flawlessness, while the chrome-lined bore and chamber resist corrosion and heat erosion, enhancing barrel life and reliability. The matte black Manganese Phosphate finish offers superior corrosion resistance, and the M4 style feed ramps ensure consistent feeding. Ideal for range time and training, FN's reputation for innovation and quality is unmatched.