Buy SIG SAUER M400-TREAD V2 COIL Rifle: Complete AR-15 Package
Buy the SIG SAUER M400-TREAD V2 COIL rifle, the ultimate factory-accessorized AR-15 platform. This ready-to-shoot package delivers immediate capability, featuring a factory-installed ROMEO5 Gen II red dot sight, M-LOK vertical foregrip, and a premium 16″ stainless steel barrel—no assembly or guesswork required.
Ready for the Range Out of the Box
Skip the time and cost of accessorizing. The M400-TREAD V2 COIL comes fully equipped with premium, purpose-built components that are factory-fitted to work in seamless harmony. From the optic to the grip, every part is installed for optimal performance, allowing you to head straight to the range with confidence.
Key Features & Factory-Installed Upgrades
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ROMEO5 Gen II Red Dot Sight: High-performance, compact optic installed and ready for immediate target acquisition.
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Complete M-LOK Forend System: Includes a vertical foregrip and barricade stop for enhanced control and stability.
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Premium 16″ Stainless Steel Barrel: Features a mid-length gas system for smooth operation and reduced recoil, with a versatile 1:8 twist rate and a SIG 3-prong flash hider.
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Enhanced TREAD M-LOK Handguard: Lightweight, free-floating design for accuracy and ample accessory mounting.
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Matchlite DUO Trigger: A crisp, 2-stage trigger for improved shot control and accuracy.
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Fully Ambidextrous Controls: Includes an ambidextrous safety and magazine release for left- or right-handed operation.
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Magpul SL-K Stock: A compact, 6-position adjustable stock for a customizable length of pull.
Detailed Specifications: Buy SIG SAUER M400-TREAD V2 COIL Rifle
| Category | Specification |
|---|---|
| SKU | RM400-16B-TRD-V2-COIL |
| Caliber | 5.56 NATO |
| Barrel | 16″ Stainless Steel, 1:8 Twist, Mid-Length Gas System |
| Muzzle Device | SIG 3-Prong Flash Hider |
| Handguard | Tread Enhanced M-LOK Black Alloy |
| Optic | SIG SAUER ROMEO5 Gen II (Factory Installed) |
| Trigger | SIG 2-Stage Matchlite DUO (Flat) |
| Stock | 6-Position MAGPUL SL-K |
| Controls | Ambidextrous Safety & Magazine Release |
| Finish | Black Anodized |
| Overall Length | 32.5″ (Collapsed) |
| Weight | 7 lbs (with optic) |
| Magazine | (1) 30-Round Polymer |
A Complete, No-Compromise AR-15 Platform
The M400-TREAD V2 COIL builds on the proven TREAD series foundation, treating you to a corrosion-resistant black anodized finish, integrated QD sling mounts, and the reliable performance of a direct impingement operating system. It’s a thoughtfully curated rifle designed for shooters who value quality, convenience, and performance from the first round.

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