The Colt LE6920-FBP1 builds on the Colt LE6920 with key accessories as approved by the FBI. This model features an 11″ Troy Alpha free-float rail, Troy Flip-up front and rear sights, and two 30 round aluminum magazines. The LE6920-FBP1 is not a standard M4 catalog model for Colt. These rifles were made available due to an overrun from an FBI production. • Manufacturer: Colt • Model: LE6920 Series FBI Model • Item Number: LE6920-FBP1 • Caliber: 5.56mm NATO • Barrel Length: 16.1″ • Bore: Chromed 6 Grooves 1-7″ RH Twist • Sights: Troy Flip-up Front & Rear Sights • Extended Length: 35.5″ • Collapsed Length: 32.0″ • Rail: 11″ Troy Alpha Free-Float Rail • Finish: Matte Black • Capacity: 30 Rounds • Action: Direct Gas System Locking Bolt…This example was sold on Gunbroker in 2018.