Description
SIG Sauer M400 TREAD V2 Coil 5.56 NATO Rifle with ROMEO5 Gen II, 16-Inch
The SIG M400 TREAD V2 Coil is the TREAD that leaves the factory ready: a ROMEO5 Gen II, an M-LOK vertical foregrip, and a barricade stop already on the 16 in. stainless rifle.
TREAD V2 is SIG’s no-compromise AR. A 16 in. stainless barrel, mid-length gas, and a Matchlite Duo two-stage sit under a TREAD-engraved free-float M-LOK handguard. SIG built V2 from shooter feedback: more handguard, a cleaner trigger, Magpul’s SL-K stock. The lower is ambidextrous on the safety and magazine release, with QD cups on the receiver.
Coil keeps the V2 stainless 16 in. barrel, mid-length gas, Matchlite Duo, and Magpul SL-K, then adds the factory ROMEO5 Gen II plus an installed M-LOK vertical foregrip and barricade stop. SIG sells it as range-ready without a separate accessorizing trip. The 3-prong flash hider and 1:8 twist match the iron-sight TREAD V2.
This Coil package
This is not a bare TREAD V2. The ROMEO5 Gen II, vertical grip, and barricade stop are on the rifle from the factory. Black anodized. One 30-round magazine. The optic is a ROMEO5 Gen II, not a ROMEO-MSR.
What ships
The iron-sight TREAD V2 is the same rifle without the Coil accessories. This is a serialized 5.56 rifle and ships to a licensed FFL. See the SIG M400 collection.
Specifications and Included Items
- Model: RM400-16B-TRD-V2-COIL
- Caliber: 5.56 NATO
- Barrel: 16 in. stainless steel, 1:8 twist, 1/2-28 tapered shoulder
- Muzzle: SIG 3-prong flash hider
- Operating system: Mid-length direct impingement
- Trigger: SIG 2-stage Matchlite Duo, flat
- Optic: Factory ROMEO5 Gen II compact red dot
- Handguard: TREAD-engraved enhanced free-float M-LOK with factory vertical foregrip and barricade stop
- Stock: 6-position Magpul SL-K
- Finish: Black anodized
- Magazine included: One 30-round polymer AR-15 magazine
- FFL: Rifle; ships to a licensed FFL dealer







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