An updated version of UndeadSewer's old Dynamic Crosshairs from PD:TH mod with extended features and minimal fuss:

• Dynamic movement and size based on your weapon stats, movement, and firing. High accuracy guns have smaller crosshairs, while high stability guns have crosshairs that move around less. Skills like Desperado can also cause your crosshair to shrink and grow to reflect their bonuses. Crosshair size also takes into account your field of view.
• Built in support for the reworked weapon handling in the Restoration Mod.
• Customizable colors and size.
• LMG Iron Sight support.
• Replaceable texture.

(out of date) Video demo:

Should be compatable with any non-crosshair related hud mods.