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's Surface is coated with dry film lube over anodized surface - Mil-Spec - Ejection Port Cover and Round Forward Assist - Right Hand Ejection - Lower Receiver: - Forged 7075 T6 Aluminum - Hard Coat Anodized - Mil-Spec - Mag Catch Button - Semi-Auto - A2 Grip - Buttstock: - MilSpec M4 Buttstock - MilSpec Buffer Tube - Carbine Buffer - Included: - 1 x 30rd Magazine - Chamber Flag - Gun Lock - Weight: 5.8 lbs. Empty - Length: - 36.375 Fully Extended - 32.625 Collapsed