After the announcement of their partnership in distributing Prometheus Inner Barrels with Laylax, Krytac announce the ability of the EG Barrels at their online shop... "The Prometheus EG Barrels by Laylax improves your accuracy and range with Japanese precision and quality. CNC machined stainless steel construction with an enlarged hop-up window allows for improved engagement with the KRYTAC Rotary Hop-up.