MDT M-LOK Adjustable Thumb Rest

A thumb rest changes how the support hand loads a rifle. Bolt it into an M-LOK slot on the forend and the thumb has a hard reference instead of floating along the handguard, which is what gets you the same hand position every time you build a position.

The rest is adjustable, so you can set it where the hand actually wants to sit rather than working around a fixed block, and it can go anywhere along the M-LOK slots on a chassis or handguard. The body is polymer, so nothing meaningful is added to the front of the rifle.