HK Army Performance Series Replacement Piston Kit Style:HP8 (800-850) • Drainage hole on the

• Drainage hole on the bottom

the Underworld will be just what a beginner needs

Full-Auto Color Tan

686 bore control insert with a unique threaded locking system

br>Magazine Capacity: 11rds

HK Army Performance Series Replacement Piston Kit Style:HP8 (800-850) • Drainage hole on theThese pistons come equipped with Belleville Shim Stack, designed for precision and ease of use. This innovative component allows you to adjust the output pressure of your regulator quickly and efficiently without needing to purchase an entirely new regulator unit. Simply pull out the entire shim stack unit and drop it into your regulator for seamless performance. The shim stack wraps around a robust brass piston equipped with all necessary O rings,