This SIG Sauer M400 Forge is a 5.56 NATO AR-15 (SIG Sauer part no. RM400-556N-16B-FORGE-MSGRN) finished in green for shooters who want the Forge’s proven performance in a look that stands apart from a standard black rifle. It runs a 16-inch barrel with a 1:7-inch twist rate for stabilizing a wide range of 5.56 loads, and feeds from a 30+1 capacity for extended range sessions. Built on a reliable semi-automatic AR platform, this configuration weighs approximately 9.7 lbs, giving it enough heft to help manage recoil without becoming cumbersome. It’s a well-rounded carbine for shooters who want SIG’s build quality with a distinctive finish for range use, home defense, or training.

Key Specifications

• Chambered in 5.56 NATO for reliable, widely available performance.
• Uses a 1:7-inch twist rate to stabilize a wide range of 5.56 loads.
• Fitted with a 16-inch barrel for a maneuverable, rifle-legal configuration.
• Feeds from a 30+1 capacity magazine setup.
• Weighs approximately 9.7 lbs as configured.
• Runs semi-automatic operation for reliable, fast-cycling performance.
• Built on a familiar AR-pattern platform.
• Finished in green for a distinctive look beyond standard black.

Frequently Asked Questions

What caliber does the M400 Forge shoot? It’s chambered in 5.56 NATO, the standard AR-platform cartridge.

What finish does it come in? This configuration is finished in green for a distinctive look.

Buy the SIG Sauer M400 Forge

Shooters who want SIG’s build quality in a distinctive finish should look closely at this 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.