Windham Weaponry's R20FFTM-308 semi-automatic features a gas impingement system and a 5-round magazine. The manual safety lever has indicator markings on both sides of the flat top receiver. The receiver is made of forged 7075 T6 aircraft aluminum with integral trigger guard and a hardcoat black anodize finish. It also features a 20" fluted barrel made from 4150M Chrome Moly Vanadium 11595E Steel.