M400 SDI 5.56MM 16" FDE 30+1 RM400-SDI-16B-FDE Manufacturer Model Number: RM400-SDI-16B-FDE Manufacturer: SIG SAUER Model: M400 SDI XSeries Caliber: 223 Rem | 5.56 NATO Type: Rifle Item Type: Firearm Firearm / Accessory Action: Semi-Auto Firearm / Accessory Capacity: 30 + 1 Finish: Flat Dark Earth Sights: None Stock Frame Grips: Collapsible / Folding Stock Magpul BSL Pistol Brace Magazine Quantity and Description: 1 30 rd. Polymer Mag Overall Length: 36.5" Weight: 7 lbs. Shipping Weight: 9.7 Feature: Aluminum MLOK Handguard Feature: Sig Flash Hider Compensator Feature: Sig 2-Stage Matchlite Duo Optic Adjustable Objective: false Optic Reticle Illuminated: false