Sig Sauer M400 Forge Rifle 5.56 NATO A 30rd A 16" CHF Barrel A TriggerTech 3.5 lb 2-Stage A ROMEO-MSR Gen II Included A FDE Cerakote The Sig Sauer M400 Forge is a 5.56 NATO semi-automatic rifle built around a 16" cold hammer forged barrel with mid-length direct impingement gas system. TriggerTech 3.5 lb two-stage flat blade duty trigger. ROMEO-MSR Gen II 2 MOA red dot included from factory. Full-length free-floating M-LOK handguard with FDE Cerakote finish and full-length Picatinny top rail. Ambidextrous charging handle. Magpul SL-K 6-position adjustable stock. Reduced angle grip. A2 birdcage flash hider on 1/2"-28 threads. 1:7 twist. One 30-round polymer magazine included. FDE Cerakote finish throughout. 6.8 lbs. 35.5" OAL extended, 32.25" collapsed. Backed by SIG Infinite Guarantee-lifetime, fully transferable warranty. SKU: RM400-556N-16B-FORGE-FDE. 16" Cold Hammer Forged Barrel 16" cold hammer forged steel barrel with 1:7 RH twist and mid-length direct impingement gas system. 1/2"-28 90-degree shouldered threads. The CHF process produces consistent bore dimensions and superior rifling for accuracy and longevity. Mid-length gas reduces recoil impulse compared to carbine-length gas on 16" barrels. TriggerTech 3.5 lb 2-Stage Trigger TriggerTech 3.5 lb two-stage flat blade duty trigger provides crisp, predictable break. The two-stage design delivers a defined wall before the break for accurate shooting-performance typically requiring aftermarket upgrade on standard AR-15 platforms. ROMEO-MSR Gen II Included ROMEO-MSR Gen II 2 MOA red dot included from factory. The factory-installed optic provides immediate fast target acquisition without separate optic purchase or mounting. M-LOK FDE Cerakote Handguard Full-length free-floating M-LOK handguard with FDE Cerakote finish and full-length Picatinny top rail. The free-float design maintains barrel harmonics by eliminating barrel-to-handguard contact. M-LOK interface accommodates lights, lasers, grips, and rail sections. Ambidextrous Charging Handle Ambidextrous charging handle accommodates left- and right-handed shooters. The ambi design eliminates need for separate left-hand charging handle. Magpul SL-K Stock Magpul SL-K 6-position adjustable stock provides adjustable length-of-pull. The SL-K's slim profile maintains compact collapsed length of 32.25". A2 Birdcage Flash Hider A2 birdcage flash hider on 1/2"-28 90-degree shouldered threads reduces muzzle flash. The 90-degree shoulder provides consistent muzzle device timing. FDE Cerakote Finish FDE Cerakote finish on receiver and M-LOK handguard provides corrosion resistance with distinctive flat dark earth appearance. SIG Infinite Guarantee Backed by SIG Infinite Guarantee-lifetime, fully transferable warranty requiring no receipts or warranty cards. The Sig Sauer M400 Forge delivers factory-ready 5.56 performance-TriggerTech 2-stage trigger with ROMEO-MSR Gen II and FDE Cerakote for out-of-box capable AR-15 capability. Specifications: Manufacturer: Sig Sauer Model: M400 Forge SKU: RM400-556N-16B-FORGE-FDE Caliber: 5.56 NATO Firearm Type: Rifle (AR-15) Action: Semi-Automatic Operating System: Mid-Length Direct Impingement Magazine Capacity: 30 rounds Magazine Type: Polymer Magazines Included: (1) 30-Round Barrel Length: 16 inches Barrel Material: Cold Hammer Forged Steel Twist Rate: 1:7 Muzzle Threads: 1/2"-28, 90-Degree Shouldered Muzzle Device: A2 Birdcage Flash Hider Handguard: M-LOK, Full-Length Free-Float, FDE Cerakote Accessory Rail: Full-Length Picatinny Trigger: TriggerTech 3.5 lb Two-Stage Flat Blade Trigger Shape: Flat Safety: Ambidextrous Grip: Reduced Angle Charging Handle: Ambidextrous Stock: Magpul SL-K 6-Position Adjustable Optic Included: ROMEO-MSR Gen II (2 MOA Red Dot) Receiver Finish: FDE Cerakote Color: Flat Dark Earth (FDE) Overall Length (Extended): 35.5 inches Overall Length (Collapsed): 32.25 inches Overall Width: 2.7 inches Height: 9.4 inches Weight: 6.8 lbs Warranty: SIG Infinite Guarantee (Lifetime, Fully Transferable)