SIG SAUER M400 TREAD V2 TacPac Rifle – 5.56 NATO, 16″ Barrel, ROMEO MSR Optic, Vertical Grip, FDE Savior Case, 3 Magazines
The SIG SAUER M400 TREAD V2 TacPac (RM400-16B-TRD-V2-TACPAC / RM40016BTRDV2TACPAC) is a complete semi-automatic rifle package chambered in 5.56x45mm NATO, combining the M400 TREAD V2 rifle with a factory accessory bundle. It is designed as a ready-to-use AR-style platform with a mounted SIG SAUER ROMEO MSR red dot optic, vertical grip, rifle case, and additional magazines.
The rifle features a 16-inch barrel, black finish, free-floating M-LOK handguard, and a 6-position adjustable stock. The TREAD V2 incorporates updates including an enhanced M-LOK handguard and SIG Matchlite two-stage trigger, while maintaining the familiar AR-15 manual of arms and modular accessory compatibility.
This TacPac configuration includes a SIG ROMEO MSR optic, vertical foregrip, FDE Savior rifle case, and three magazines, making it a complete package for range use, training, and general-purpose shooting.
Specifications
| Feature | Specification |
|---|---|
| Manufacturer | SIG SAUER |
| Model | M400 TREAD V2 TacPac |
| Model Number | RM40016BTRDV2TACPAC |
| Caliber | 5.56x45mm NATO |
| Action | Semi-Automatic |
| Operating System | Direct Impingement |
| Barrel Length | 16 inches |
| Barrel Type | Stainless Steel / configuration dependent |
| Finish | Black |
| Handguard | Free-Floating M-LOK |
| Stock | 6-Position Adjustable Stock |
| Trigger | SIG Matchlite 2-Stage Trigger |
| Optic Included | SIG SAUER ROMEO MSR |
| Grip | Vertical Grip Included |
| Magazine Capacity | 30 Rounds (configuration dependent) |
| Magazines Included | 3 Magazines |
| Case Included | FDE Savior Rifle Case |
| Receiver Material | Aluminum |
Package Features
- Chambered in 5.56 NATO
- 16-inch barrel
- SIG M400 TREAD V2 rifle platform
- Free-floating M-LOK handguard
- SIG Matchlite two-stage trigger
- Adjustable collapsible stock
- SIG ROMEO MSR red dot optic included
- Vertical grip included
- FDE Savior rifle case included
- Three magazines included
- AR-15 compatible controls and accessories
The SIG SAUER M400 TREAD V2 TacPac is a bundled version of the M400 TREAD platform that provides the rifle plus several common upgrades and accessories out of the box. It is intended for shooters who want a complete 5.56 NATO setup without having to purchase an optic, case, and accessories separately.



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