Nemo Arms exclusive OMEN spare parts kit. This kit was designed and engineered from the ground up to support the powerful demands of the OMEN 300 Win Mag Rifles. The kit includes: Firing Pin Firing Pin Spring Bolt Gas Ring Extractor Extractor Spring, Stiffener, Donut, and Pin Ejector Ejector Spring, Roll Pin BCG Carrier Extension BCG Carrier Extension Spring, Roll Pins Mfg: Nemo