SIG Sauer M-LOK 15" M400 Tread Free Float Handguard, Black - HGRDTRDE15MLOKBLK
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Sig Sauer
Overview
The Sig Sauer M-LOK 15" M400 Tread Free Float Handguard is designed to enhance your AR-15's performance by providing a lightweight and rigid platform that doesn’t interfere with barrel harmonics. With its free-float construction, it allows for improved accuracy by preventing any contact with the barrel, while the 15-inch length offers ample space for accessories along the M-LOK mounting interface. This handguard is particularly favored in mid-length gas system builds chambered in 5.56 NATO, making it a solid choice for those looking to optimize their rifle setup.
Specifications
SIG Sauer M-LOK 15" M400 Tread Free Float Handguard, Black - HGRDTRDE15MLOKBLK
Build history on GunPartPicker
Builders on GunPartPicker first added the SIG Sauer M-LOK 15" M400 Tread Free Float Handguard, Black - HGRDTRDE15MLOKBLK to a build in January 2026.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 4 of the 7 retailers we track have it in stock. Prices barely moved in August 2026, holding around $112.84, so there haven't been real sales lately. Buying today, the lowest price is $112.84 at BattleHawk Armory, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 5 builds that include this one
Anderson Manufacturing Closed Trigger AR15-A3 Lower Receiver AR15-A3-LWFORUM
AR-15 Upper Receiver Assembled No Auto Sear Cut - 5.56mm Assembled Upper Rcvr No Auto Sear Cut For AR-15 Black
5.56 Bolt Carrier Group, No Logo - Phosphate
WMD Guns AR-15 Gas Tube Nitromet Mid-Length
FAXON Firearms 16" Gov't/socom 5.56 NATO Mid-Length 4150 QPQ
Strike Industries Collar Adjustable Gas Block
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all 3 →Builds in the community that include the Sig Sauer M-LOK 15" M400 Tread Free Float Handguard, Black - HGRDTRDE15MLOKBLK
| Build | Parts | Total |
|---|---|---|
 | 16 | $1324.12 |
 | 20 | $1862.51 |
| 11 | $878.51 |
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