The SIG Sauer M400 Forge is a 5.56 NATO AR-15 (SIG Sauer part no. RM400-556N-16B-FORGE) built to come out of the case ready to shoot, with a factory-mounted ROMEO-MSR Gen II red dot already zeroed for close and mid-range work. It runs a 16-inch cold hammer forged barrel with an FNC finish and a mid-length gas system, paired with a 1:7-inch twist rate for stabilizing a wide range of 5.56 loads. A TriggerTech 3.5-pound two-stage flat blade duty trigger gives shooters a clean, consistent break, while the 15-inch free-float M-LOK handguard with a full-length Picatinny rail leaves plenty of room for lights and accessories. An ambidextrous charging handle and a 6-position Magpul SL-K stock round out a build that weighs in at approximately 6.8 lbs with a loaded 30-round magazine, making the Forge a well-equipped, ready-to-run carbine for range use, home defense, or duty.
Key Specifications
- Chambered in 5.56 NATO for reliable, widely available performance.
- Fitted with a 16-inch cold hammer forged barrel with an FNC finish and a 1:7-inch twist rate.
- Runs a mid-length gas system for smoother cycling.
- Includes a TriggerTech 3.5-pound two-stage flat blade duty trigger.
- Ships with a factory-mounted ROMEO-MSR Gen II red dot with a 2 MOA dot.
- Wears a 15-inch free-float M-LOK handguard with a full-length Picatinny rail.
- Equipped with a 6-position Magpul SL-K stock.
- Fitted with an ambidextrous charging handle.
- Feeds from a 30-round magazine.
- Weighs approximately 6.8 lbs with a loaded magazine.
Frequently Asked Questions
Does the M400 Forge come with an optic? Yes, it ships with a factory-mounted ROMEO-MSR Gen II red dot with a 2 MOA dot.
What is the magazine capacity? It ships set up to run a 30-round magazine.
What trigger does it use? It’s equipped with a TriggerTech 3.5-pound two-stage flat blade duty trigger.
Buy the SIG Sauer M400 Forge
Shooters who want a ready-to-run carbine straight out of the case should look closely at the M400 Forge. Order this SIG Sauer rifle from our AR rifle selection at Schaefer Defense, and we’ll ship it insured to your local FFL from our Lubbock, Texas shop.
