Modular MLOK storage foregrip. Base attaches to your mlok rail, then choose a size of the foregrip. Base has two options, with or without a forward finger stop. Smallest size grip (cap) can hold several 20mm diameter coin cell batteries, medium (short) can hold a single CR123, and the longest can hold 2 CR123 batteries.
Requires mlok hardware, such as this:
https://a.co/d/8fBiGqo