M-LOK Workhorse 4 Free Float Handguard Aluminum Black
$118.95 at Ammunition Depot · 3 stores
In stock
M400 Tread Replacement Handguards - 15" M-LOK Enhanded Handguard, Black
Sig Sauer · Rails & Handguards
No ratings yetBest price
$119.99at GunMag Warehouse
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $119.99checked Oct 1, 2026 | In stock | Buy at GunMag Warehouse | |
| OpticsPlanet | $135.49Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| MidwayUSA | $146.99checked Oct 1, 2026 | In stock | Buy at MidwayUSA | |
| Sportsman's Warehouse | $149.99checked Oct 1, 2026 | In stock | Buy at Sportsman's Warehouse | |
| Battlehawk Armory | $112.84Salechecked Oct 1, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $129.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $132.99checked Oct 1, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $119.99 at GunMag Warehouse. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Battlehawk Armory | $112.84 | $112.84 | $112.84 |
| Brownells | $132.99 | $132.99 | $132.99 |
| GunMag Warehouse | $119.99 | $119.99 | $119.99 |
| MidwayUSA | $146.99 | $146.99 | $146.99 |
| OpticsPlanet | $135.49 | $135.49 | $135.49 |
| Palmetto State Armory | $129.99 | $129.99 | $129.99 |
| Sportsman's Warehouse | $149.99 | $149.99 | $149.99 |
Since Sep 28, 2026.
About this part
The M400 Tread Replacement Handguards - 15" M-LOK Enhanded Handguard, Black is a 15" AR-15 handguard from Sig Sauer. It's sold by 7 stores (4 in stock), from $112.84 to $149.99. The lowest in-stock price in the last 30 days was $119.99 at GunMag Warehouse.
Fits and works with
- Handguard length
- 15" · Barrels
Specifications
- Manufacturer
- Sig Sauer
- Color
- Black
- Platform
- AR-15
- Length
- 15"
- Attachment
- M-LOK
From the manufacturer
Factory replacement handguards for the SIG SAUER M400 TREAD. Does not include mounting hardware, use existing hardware. Mfg: Sig Sauer, Inc.
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