Performance Series - MP5 MID Pressure Piston (450-550psi) PEQ-15 These foam ears are as

These foam ears are as stylish as they are functional

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Performance Series - MP5 MID Pressure Piston (450-550psi) PEQ-15 These foam ears are asUpgrade your HK Army Performance Series Regulator with the MP5 (Mid Pressure 500psi). Piston. These 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