Sig Sauer M400

The Sig Sauer M400 is a semi-automatic firearm, intended for civilian and law enforcement markets. It fires from a close bolt and uses a direct gas impingement system. It is manufactured by SIG Sauer and it is based on the earlier AR-15 rifle. The rifle is hammer-fired with a single-stage trigger in most models. Some models include a two-stage trigger from the factory.


Weapon type:semi-automatic rifle
Weight:3.45 kg
Calibre & cartridge: .223REM (5.56×45mm NATO)
Manufacturer:SIG Sauer
Action:Direct gas impingement system, rotating bolt
In service:2010–Present