Primos Bi Pod Trigger Stick. The Trigger Stick is a lightweight height-adjustable gun rest and optical gear mount, perfect for sitting, kneeling or standing. It comes equipped with a detachable V yoke. The Trigger Stick fits 1/4"-20 & 3/8"-16 threaded fixtures for securing optical gear. Two-piece Bi-Pod. Features: Adjusts to your desired height. Lightweight and easy to carry. Straps to your gun for added security. Specifications: Two-piece Bi Pod. Includes: wrist strap. Available in two sizes: 23.5-32.5" or 36.5 - 61". Contents: Bi Pod Trigger Stick.