Features: Simple & effective design works just like an extractor in an M16 rifle Will not pull out like other extractors if a sticky cartridge is encountered Used by the Naval Surface Warfare Center in Mk 13 sniper rifles Made from pre-hardened 4142 steel Includes extractor, roll pin and extractor spring Available for Standard calibers (308), Magnum calibers & Lapua/Rigby based calibers. Gunsmith installation required Requires modification to existing bolt Mfg: Badger Ordnance Requires modification of existing bolt. Gunsmith installation required.