By exceeding military standards, Core Systems ensures the best fit possible and can offer a more reliable, smoother functioning, and more accurate weapon that will provide you with the peace of mind that you deserve. The Core 15 Tac M4 has a direct gas impingement system with a gas tube made of 304-grade stainless steel. The chrome-lined 16" M4 profile stainless steel match-grade barrel comes mated with a Mil-Spec forged 7075-T6 upper and lower receiver and a Magpul MOE six-position stock with a pistol grip. The lower receiver has a beveled magwell for improved reloading speed, machined chevrons in front strap, and bullet pictogram safety markings. The upper receiver has M4 feed ramps and a 1913 Picatinny flat top rail. A Core 15 V.2 Hardcore Billet charging handle and oversized trigger guard, a free-floating quad rail, and a Magpul MOE MBUS rear sight make the M4 Tac ready to fire out of the box. A 30-round Magpul PMAG is included.