Springfield Armory Echelon to EPS DOGTAGThe Echelon from Springfield Armory sets a new standard for modern, striker fired duty pistols. With a host of patent pending features, this modular and highly adaptable handgun is designed around a robust stainless steel chassis and revolutionary optics mounting system. Available in full size (4. 5F) and new compact (4. 0C) configurations, it is engineered with superior ergonomics and built to withstand the harshest conditions. The patent pending