Air Systems & Parts

Tank Regulator Bonnet Replacement Bonnet for Empire, GI Sportz, HK Army, Tippmann, and Valken Tank Regulators. *NOTE* Fits the HK Army 4500 Basic R...

HK Army Tank Regulator Replacement Bonnet (New Style) (Double O-Ring) DOES NOT INCLUDE SCREWS

These pistons come equipped with Belleville Shim Stack, designed for precision and ease of use. This innovative component allows you to adjust the ...

Upgrade your HK Army Performance Series Regulator with the MP5 (Mid Pressure 500psi). Piston. These pistons come equipped with Belleville Shim Stac...

Silver fill nipple which is used for both the 3000psi and 4500psi air tanks.Warning!  Always make sure to turn off the air calve before releasing t...

HK Army GaugeHK Army Micro Gauge 4500 PSI

HK Army replacement 4500psi compressed air tank regulator piston for Standard and Aerolite tanks - Brass DOES NOT INCLUDE PIN HARDWARE 

HK Army Aerolite Low Pressure Piston/Shim Assembly 250-400psi Output This is only compatible for HK Army Aerolite 4500psi Regulators