sig m400 tread v2 5.56 rifle

SIG Sauer M400 Rifles

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SIG M400 Rifles

The SIG M400 is SIG’s direct-impingement 5.56 AR family. TREAD V2 is the no-compromise rifle: a 16 in. stainless barrel, Matchlite Duo, and a TREAD-engraved M-LOK handguard. SDI X is the Academy rifle, fully ambidextrous including a bolt catch unique to that lower. FORGE is the duty package: a cold-hammer-forged barrel, TriggerTech’s 3.5 lb two-stage, and a factory ROMEO-MSR Gen II. ROSE is the ROSE-series AR with a 10 in. engraved handguard, rose-gold controls, and a factory ROMEO5 Gen II.

Coil puts a ROMEO5 Gen II, a vertical grip, and a barricade stop on TREAD V2. Sentry puts a ROMEO5 Gen II, a FOXTROT-MSR full-size light, and a vertical foregrip on SDI X. 11.5 in. TREAD, SDI X, and FORGE pistols use Magpul’s BSL brace and ship as pistols. Ten-round and California rifles keep the same barrels and change the magazines — confirm local rules with your FFL.

How to choose

Want the stainless TREAD and no factory optic? Start with TREAD V2 in black, moss green, or Concrete. Want the Academy ambi lower? SDI X. Want the optic and the TriggerTech already on the gun? FORGE. ROSE is the ROSE kit with the Savior case. These are serialized 5.56 firearms and ship to a licensed FFL. See also SIG Sauer rifles.

Frequently Asked Questions

What is a SIG M400?

The M400 is SIG’s direct-impingement 5.56 AR family. TREAD V2 is the stainless no-compromise rifle. SDI X is the Academy ambidextrous rifle. FORGE is the cold-hammer-forged duty package with a factory ROMEO-MSR Gen II. ROSE is the ROSE-series AR with a factory ROMEO5 Gen II.

What is the difference between TREAD V2, SDI X, and FORGE?

TREAD V2 uses a 16 in. stainless barrel, Matchlite Duo, Magpul SL-K, and a TREAD-engraved M-LOK handguard. SDI X adds fully ambidextrous controls including a unique bolt catch and a dual-clamp handguard. FORGE uses a cold-hammer-forged barrel, a TriggerTech 3.5 lb two-stage, and a factory ROMEO-MSR Gen II 2 MOA.

Does the M400 ROSE use a ROMEO-MSR?

No. SIG’s ROSE rifle ships with a ROMEO5 Gen II with the ROSE logo. FORGE is the M400 that ships with a ROMEO-MSR Gen II. Coil and Sentry also use a ROMEO5 Gen II.

What is the M400 Sentry?

Sentry is the SDI X package with a factory ROMEO5 Gen II, a FOXTROT-MSR full-size light, and a vertical foregrip. SIG lists the light at 1,250 lumens and 33,000 candela.

Are some M400s pistols?

Yes. The 11.5 in. TREAD, SDI X, and FORGE configurations with a Magpul BSL brace are pistols and ship to a licensed FFL as handguns. The 16 in. guns with stocks are rifles.

Do I need an FFL to buy an M400?

Yes. These are serialized 5.56 firearms. Rifles and pistols both ship to a licensed FFL. Confirm magazine capacity and local rules on the product page.

What magazines does the M400 take?

These M400s take AR-15 pattern 5.56 magazines. Unrestricted rifles typically ship with one 30-round polymer magazine. ROSE unrestricted ships two 30-round magazines. Ten-round and California rifles ship with 10-round magazines.