Idaho Arms & Ammo is the Premier Sionics dealer in Idaho. With over 400 Law Enforcement agencies across the country trust their lives to Sionics, including our own Garden City Police! Base Configuration: Upper Receiver: 7075 M4 AR15 Style Carbine, 5.56mm NATO Barrel: SIONICS 16” Chrome Lined Barrel – Medium Contour, 41V50, NATO Chamber, 1:8, Air-Gauged, Radiograph and MP Inspected Gas System: Mid-Length, Direct-Impingement Muzzle Device: SIONICS A2 Flash Hider Bolt Carrier: SIONICS Phosphate Bolt Carrier Group Bolt: Carpenter No.158, HP/MPI Tested, Black Insert and Sprinco 5-Coil Heavy Extractor Spring Lower Receiver: Forged 7075-T6 Aluminum Trigger: SIONICS Enhanced Mil-Spec Trigger Assembly Safety Selector: SIONICS Standard Ambidextrous Selector Receiver Extension: SIONICS 6 Position Mil-Spec Receiver Extension (Dry Film Lubricated) Buffer: H Buffer Charging Handle: Radian Raptor Ambidextrous Charging Handle Action Spring: Sprinco Blue Stock: Magpul MOE SL Stock Grip: Magpul MOE-K2 AR15 Grip Hand Guard: 15″ SIONICS – M-LOK Handguard with 5-Slot Rail Piece NP3 Full Auto BCG w/OCKS gas key hardware (1) Magpul PMAG 30rd Magazine and rifle bag.