The SIG M400 is the first M4-style rifle with the SIG name. It is a semi-automatic rifle. There are multiple different models of the SIG M400 including the Classic, SRP, Tread, Elite, and Predator. It was first produced in 2010.
An M4 can mean a carbine that is capable of selective fire, such as weapons used by the US Military. By this definition, the SIG M400 is not an M4 since it is not fully automatic. However, an M4 can also mean a weapon in this style, but designed to be semi-automatic. This is similar to an AR-15-style rifle but with a shorter barrel. The SIG M400 fits this second definition.
Carbine gas systems have the gas port at the 7.5 inch mark on the gun’s barrel, whereas mid-length systems have the gas port at 9.5 inches. The SIG M400 is designed as a carbine with a shorter barrel and uses a carbine gas system.
The SIG M400 Elite Vanish rifle is .223 Remington caliber. The SIG M400 Tread is 5.56 NATO caliber. These are fairly close in size, but are not exactly the same. In general, you should not use 5.56 in a .223 chamber, but in some reverse circumstances you can use .223 in a 5.56 chamber.
The specs for the SIG M400 Elite Vanish rifle are as follows:
|OPERATING SYSTEM||Direct Impingement|
|LENGTH (Overall)||38.25 in (972 mm)|
|WIDTH (Overall)||2.5 in (64 mm)|
|BARREL LENGTH||20 in (508 mm)|
|WEIGHT||7 lbs. (112 oz, 3.2 kg)|
No, a SIG M400 uses a direct impingement system. The difference is that gas piston systems have propellant gases in a separate cylinder whereas direct impingement systems bleed propellant gas through a small hole located in the barrel. Direct impingement is the original system used for AR-15-style firearms.
Mil-Spec is short for “military specifications” and means that a firearm meets all criteria set by the US military. The SIG M400 carbine is generally considered Mil-Spec. However, the version sold to civilians is still going to be different than the version available to the military. Notably, a civilian SIG SAUER M400 will be semi-automatic, not fully automatic.
What is and isn’t a good gun will be highly subjective and depends on your personal preferences and the gun’s intended use. The M400 line is generally considered a high-quality choice for M4-style rifles. The SIG M400 Elite Vanish rifle in particular is well-suited for hunting.
Before cleaning your SIG SAUER firearm, consult the owner’s manual for specific tips for maintenance and operation. Make sure that you double and triple check that your gun is unloaded before you begin cleaning. You should clean the bore as well as lubricating certain key points of the weapon.
The SIG M400 Elite Vanish rifle uses .223 Remington ammo. The SIG M400 Tread uses 5.56 NATO ammo. However, you may be able to use .223 Remington ammo as well in the Tread model.
Weapon-mounted lights are a good option for increased visibility. You may also want to consider adding optics to your rifle. Which accessories you choose will depend on your preferences. You should also consult your owner’s manual to make sure that any accessories you purchase will fit your gun.
At The Hub, we offer the SIG SAUER M400 Elite Vanish for $1,141.86. We offer the Tread model for $803.49. Prices may change and we are always updating our offers, so make sure to check our online store regularly.
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