Sig Sauer M400 Forge Pistol

The Sig M400 Forge Pistol takes the same duty-ready component stack as the 16-inch rifle - factory TriggerTech duty trigger, Breek Arms Warhammer ambidextrous charging handle, Romeo MSR Gen II red dot, and Sig's Infinite Guarantee - and repackages it into an 11.5-inch AR pistol platform. The shorter barrel uses a chrome-lined bore with external FMC coating to handle the higher heat and pressure of a carbine-length gas system on a sub-16-inch tube. A Magpul BSL pistol stabilizing arm brace replaces the SL-K stock, and the handguard drops to 10 inches of free-float M-LOK real estate.

At 6.2 pounds and 27.8 inches collapsed, the Forge Pistol targets the home-defense, vehicle-ops, and suppressor-host segment where a 16-inch rifle is unwieldy but an SBR tax stamp is unwanted. Keeping the pistol classification via the Magpul BSL brace avoids NFA paperwork while retaining most of the handling benefits of a short-barrel configuration. The factory-mounted Romeo MSR Gen II red dot is well-matched to the intended ranges, and the TriggerTech duty trigger eliminates the single most common upgrade cycle on AR pistols in this price bracket.

An SBR variant with the same 11.5-inch barrel and a rigid stock in place of the brace is also available for NFA-registered buyers. Pricing for the pistol variant is estimated at $1,099 based on Sig's typical short-barrel premium over the $999 base rifle; confirm current street price with Primary Arms or other Sig dealers.