SIG TREAD HANDSTOP KIT MLOK BLK

Description

The Sig Sauer TREAD Handstop Kit is a factory-sourced accessory designed for the M400 TREAD platform, though its M-LOK interface means it mounts cleanly on any M-LOK compatible handguard. That compatibility matters if you run a different host rifle but want components that were developed and toleranced alongside Sig’s own furniture line rather than spec’d independently.

The kit ships with both a long and a short handstop, letting you pick the profile that fits your hand position and shooting style. The two-piece approach is more useful than a single fixed-length option: a shorter stop works well for a thumb-over-bore grip or a more compressed support-hand position, while the longer version gives a more defined index point for shooters who prefer to lock the hand further forward under recoil. Neither version requires modification — M-LOK connectors and all mounting hardware are included, so installation is straightforward with standard tools.

The handstops are made from high-strength polymer, which keeps the weight addition minimal. On a rifle you’re already carrying with an optic and a light, that matters. The polymer construction also means there’s no meaningful cold-weather conductivity penalty the way an aluminum handstop can introduce when temps drop.

This kit is the handstop-only configuration. Sig also offers a broader forward grip kit that bundles in a vertical grip and barricade stop alongside the handstops and rail sections, so if you want more mounting options in a single purchase, that kit exists as a separate SKU. If you already have a grip arrangement you’re satisfied with and just want a clean hand index point, this kit gives you exactly that without the extras.