ZCI Rotary plastic M4 Hop Unit

Word on the street - These are GOD TIER on custom F2 M4 Builds 👀

Features: 

• Made of sturdy plastic
• Includes all necessary fittings.
• Metal arm pin and just the right amount of tension on the rotary wheel.
• Comes with a larger barrel spring for sliding over the inner barrel, a smaller barrel spring
• ZCI shore 60 silicon bucking and nub. 
• Unlike other cheaper hop chambers that have a molded nub on the arm, the ZCI version uses a concave design perfect for Omega, 4uantum nubs and more

We suggest a small amount of silicone grease where the wheel meets the o-ring