Springfield Armory has begun selling its Echelon COG separately for $295, and because that unit is serialized an FFL transfer is required. Buyers previously had to purchase a full Echelon pistol to obtain one. The stainless-steel assembly uses tool-steel trigger parts, coatings Springfield says reduce friction, and a second sear intended to prevent firing if dropped; it works with the firm's Compact and Full-Size frames plus 4.0-inch and 4.5-inch slides in standard or compensated styles, and with aftermarket parts.