The Ferret50 upper receiver manufactured by Spider Firearms is designed as a modular system which can convert an AR-15 style lower receiver into a single shot bolt action rifle chambered for .50 BMG. Features a three-lug bolt, claw type extractor, plunger type ejector, free-floating Lothar Walther Supermatch heavy stainless steel barrel with four-chamber muzzle brake capable of .2MOA accuracy, and a detachable bipod. The upper is fitted to a standard CMMG Inc. Model 4SA lower receiver with target style pistol grip and solid buttstock. Includes a Leupold Osprey 10-40x50 scope.

Excellent, retains 95% plus original matte black finish on the both the upper and lower receivers, as well as the muzzle brake with some scattered light edge and high spot wear. The barrel is bright stainless steel. The grip and stock have some scattered light handling marks. Mechanically excellent. The optics are clear.