TROY SPC A4 is perhaps TROY's most conventional and versatile model. the TROY SPC A4 offers durable accessories that TROY is know for: TROY Front and Rear Folding BattleSights TROY SOCC M-LOK Rail; TROY Medieval Muzzle Break.Specifications: Model: SPC A4 - 16? Caliber: 5.56mm Magazine Capacity: 30 Round Magazine Firing Modes: Semi-Automatic Operating Systems: Gas Operated Length - Extended: 36? (91.44cm) Length - Collapsed: 32.12? (81.60cm) Barrel Length: 16? (40.64 cm) Barrel Weight: 6 lbs (2kg) Sight Radius: 20? (50.8cm) Safety: Manual lever with indicator markings on both sides of receiver Muzzle Device: TROY MedievalA(R) Flash Suppressor Rifling: 1 turn in 7? right hand twist Trigger: Standard MIL-SPEC Trigger Stock: MagPulA(R) Forend: TROY 15? SOCC M-LOKA(R) BattleRail Pistol Grip: TROY Control Pistol Rear Sight: TROY Rear Folding BattleSight(TM) Front Sight: TROY Front Folding BattleSight(TM) Magazine: TROY 30 Round BattleMagA(R) Material: Aircraft Grade 6061-T6 Aluminum Finish: Mil-Spec Hard Coat Anodized