M400 SDI 5.56MM 16" BLK 30+1 RM400-SDI-16B-P | MAGPUL STOCK Manufacturer Model Number: RM400-SDI-16B-P 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: FNC Sights: None Stock Frame Grips: Collapsible / Folding Stock MAGPUL SL Stock Magazine Quantity and Description: 1 30 rd. Overall Length: 33.5" - 36.8" Weight: 7 lbs. Shipping Weight: 10.0 Feature: Fluted Competition Barrel Feature: SIG Flatblade Match Trigger Feature: Hybrid Compensator/Flash Hider Optic Adjustable Objective: false Optic Reticle Illuminated: false