The Echo 316L Optics ready has a 16 light weight melonite barrel with a low profile gas block 1x9 twist MilSpec M4 stock CAR handguards with single heat shields and A2 flash hider. The Echo 316L Optics Ready comes with 1x 30rd magazine and a CA approved Gun Lock. Shipped with a Chamber Safety Tool in the chamber clearly showing the weapon is unloaded. - Barrel: - 4140 Melonite Steel - 16 Length 1x9 Twist - Carbine Gas System - Threaded Muzzle A2 Flash Hider - Manganese Phosphated - Melonite under DTI Low Profile Gas Block - Lightweight Profile - Chamber: 5.56 x 45mm - Bolt & Carrier: - Phosphated 8620 Steel Carrier Assembly - Carpenter 158 Bolt - Heat Treated and Plated - Mil-Spec - Chrome Lined Carrier Interior - Carrier Key - Chrome Lined attached with Grade 8 Screws - Properly Staked & Sealed Gas Key - Handguards: 0 Carbine Length - Aluminum Delta Ring - Single Heat Shield - Upper Receiver: - Forged 7075 T6 Aluminum - A3 Flat Top w/ White T-Marks - Hard Coat Anodized - Bore