The SIG 1911 Fastback Nightmare in 10mm Auto features a rounded bobtail mainspring housing that facilitates concealment, a nitron-finished stainless frame, and Siglite night sights in a Government-length package chambered for the full-power 10mm cartridge. Type: Semi-Automatic Pistol Action: Single-Action Caliber: 10mm Auto Capacity: 8 Year introduced: 2015, USA Weight: 40.5 oz Overall length: 8.5" Status: Discontinued Intended use: self_defense, collecting, sport