Sig Sauer115663479
Sig Sauer M400 Tread 13" M-LOK Handguard - Black Finish$136.88
Availability: In Stock
The Sig Sauer M400 Tread 15" M-LOK handguard is a direct-fit upgrade for shooters looking to customize their Sig Tread rifle with a modern free-float rail system. This slim, lightweight handguard strips away unnecessary weight with aggressive lightening cuts while maintaining a full 15 inches of modular real estate for mounting lights, lasers, bipods, and other tactical accessories via M-LOK slots. It's a straightforward two-screw replacement designed to drop right onto your M400 Tread platform.
The black finish coordinates with Sig's factory aesthetic and blends seamlessly with modern AR builds. While the handguard itself is compatible with standard AR-15 pattern receivers, a critical detail: this version does not include a barrel nut. If you're installing it on a Sig M400 Tread, that's a non-issue—the barrel nut is already there. However, if you're planning to use this rail on a different AR-15 platform, you'll need to source a compatible barrel nut separately, which isn't included in the box.
For M400 Tread owners, this is the straightforward bolt-on solution to modernize your handguard geometry and add M-LOK mounting flexibility without the guesswork of cross-platform compatibility. The free-float design isolates the barrel from the handguard, which can improve consistency if you're chasing tighter groups at the range. Weighing less than the factory setup thanks to those lightening cuts, every ounce matters on a working rifle.
| Length | 15 inches |
| Mount Type | M-LOK |
| Finish | Black |
| Design | Free-float |
| Mounting Method | Two-screw replacement |
| Barrel Nut Included | No |
| Primary Application | Sig M400 Tread |
| Cross-Platform Compatibility | AR-15 pattern rifles (barrel nut required, sold separately) |
Yes. This is a direct two-screw replacement for the Sig M400 Tread rifle series and requires no additional parts.
The handguard is compatible with standard AR-15 pattern rifles, but you will need a compatible barrel nut, which is not included. You'll need to source and install the appropriate barrel nut separately.
The handguard itself. The barrel nut is not included.
M-LOK is a modular mounting system that accepts M-LOK-compatible accessories—lights, lasers, bipods, grips, and other tactical attachments—without requiring a full Picatinny rail. Slots run along the handguard, and accessories attach using a tool-free or tool-based clamping system.
SKU: 115825176 • Width: 4in • Height: 3.3in • Depth: 17in • Weight: 1oz
Availability: In Stock
The Sig Sauer M400 Tread 15" M-LOK handguard is a direct-fit upgrade for shooters looking to customize their Sig Tread rifle with a modern free-float rail system. This slim, lightweight handguard strips away unnecessary weight with aggressive lightening cuts while maintaining a full 15 inches of modular real estate for mounting lights, lasers, bipods, and other tactical accessories via M-LOK slots. It's a straightforward two-screw replacement designed to drop right onto your M400 Tread platform.
The black finish coordinates with Sig's factory aesthetic and blends seamlessly with modern AR builds. While the handguard itself is compatible with standard AR-15 pattern receivers, a critical detail: this version does not include a barrel nut. If you're installing it on a Sig M400 Tread, that's a non-issue—the barrel nut is already there. However, if you're planning to use this rail on a different AR-15 platform, you'll need to source a compatible barrel nut separately, which isn't included in the box.
For M400 Tread owners, this is the straightforward bolt-on solution to modernize your handguard geometry and add M-LOK mounting flexibility without the guesswork of cross-platform compatibility. The free-float design isolates the barrel from the handguard, which can improve consistency if you're chasing tighter groups at the range. Weighing less than the factory setup thanks to those lightening cuts, every ounce matters on a working rifle.
| Length | 15 inches |
| Mount Type | M-LOK |
| Finish | Black |
| Design | Free-float |
| Mounting Method | Two-screw replacement |
| Barrel Nut Included | No |
| Primary Application | Sig M400 Tread |
| Cross-Platform Compatibility | AR-15 pattern rifles (barrel nut required, sold separately) |
Yes. This is a direct two-screw replacement for the Sig M400 Tread rifle series and requires no additional parts.
The handguard is compatible with standard AR-15 pattern rifles, but you will need a compatible barrel nut, which is not included. You'll need to source and install the appropriate barrel nut separately.
The handguard itself. The barrel nut is not included.
M-LOK is a modular mounting system that accepts M-LOK-compatible accessories—lights, lasers, bipods, grips, and other tactical attachments—without requiring a full Picatinny rail. Slots run along the handguard, and accessories attach using a tool-free or tool-based clamping system.
SKU: 115825176 • Width: 4in • Height: 3.3in • Depth: 17in • Weight: 1oz