This stock increases Run Speed, Scope-In time, Spread - Aim, Move, and Recoil while decreasing Spread - Move and Range.
The stock is a great choice for snipers as Recoil on a Bolt-Action Rifle is already high, and you will be able to aim faster with it and run away from fights easier.
Pre-Parity Patch this stock was known as Frontier Uls-Ultralight.
In-game Description Edit
Light stock. Significantly improves running speed, but impairs spread, recoil, and range.