Sig Sauer M400-Tread V2 Coil 5.56 NATO 30rd 16" Barrel Romeo5 Gen II Compact Red Dot Vertical Grip Barricade Stop Rifle

The M400-TREAD V2 COIL brings a factory-built, range-ready mentality to the platform—no guessing or bolt-on shopping required. Purpose-fit upgrades like the ROMEO5 Gen II compact red dot, installed M-LOK vertical foregrip, and barricade stop arrive pre-installed and optimized to work with the enhanced free-floating TREAD handguard. The 16" stainless barrel with a 1:8 twist and mid-length gas system delivers smooth, predictable cycling and controllable recoil; paired with the SIG 2-stage Matchlite DUO trigger and Magpul SL-K stock it’s setup for accurate, comfortable follow-up shots right out of the box.

Specifications:

• SKU: RM400-16B-TRD-V2-COIL

• Caliber: 5.56 NATO

• Sights: ROMEO5 Gen II compact red dot (installed)

• Barrel Length: 16 in (406.4 mm) stainless steel

• Twist Rate: 1:8

• Threads: 1/2"-28 tpi tapered shoulder

• Muzzle Device: SIG 3-prong flash hider (installed)

• Action Type: Semi-Auto

• Operating System: Mid-length direct impingement

• Stock: 6-position Magpul SL-K

• Grip: Reduced angle polymer pistol grip

• Trigger: SIG 2-Stage Matchlite DUO (flat shoe)

• Manual Safety: Ambidextrous

• Forend: Tread Enhanced M-LOK black alloy (free-floating)

• Accessory Rail: M-LOK

• Magazine Type: AR-15 (1) 30-rd polymer mag included

• Receiver Finish: Black anodized

• Overall Length: 32.5 in

• Collapsed / Folded Length: N/A

• Overall Width: 2.6 in

• Height: 9.25 in (with optic installed)

• Weight: 7.0 lb

• Adjustable Gas System: No (mid-length piston/DI specified as direct impingement mid-length)

• Included Accessories: ROMEO5 Gen II, M-LOK vertical foregrip, barricade stop, (1) 30rd mag