The M400 X-series features a free-floating M-LOK handguard, Magpul SL-K 6-position telescoping stock, Sig Flat Match Grade trigger, 16" Chrome Moly barrel, and a 7075 T-6 aluminum receiver with a black hardcoat anodized finish.

Sig Sauer RM400SDI16BP M400 X-Series 5.56x45mm NATO 16" 30+1, Black, Magpul SL-K Stock, OEM Polymer Grip, Flat Match Trigger

Caliber: 5.56x45mm NATO
Model: M400
Stock Finish Group: Black
Capacity: 30+1
Stock Material: Synthetic
Action: Semi-Auto
OAL: 33.50"- 36.75"
Hand: Right
Sights: Optic Ready
Barrel Finish: Black FNC
Muzzle: Hybrid Compensator / Flash Hider
Twist: 1:7"
Gun Platform: AR-Style
Magazine Type: AR-15
Grips: Black Polymer
Handguards: 15" Free-Float M-LOK
Receiver Material: Aluminum
Safety: Ambidextrous Manual
Thread Pattern: 1 / 2"-28 tpi
Stock Description: 6 Position Magpul SL-K
Barrel Description: 16" Chrome Moly Steel
Barrel Length: 16"
Receiver Finish: Black Anodized
Trigger: Sig Flatblade Match
Weight: 7 lbs