Filling your PCP airgun with Nitrogen is another option to consider. The air from a Nitrogen tank is cleaner and dryer than the air generated
PCP Airgun equipment
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Alkin W33 Mariner Canopy, and Silent Stationary Series high pressure compressors can be configured to compress air up to 5000 psi. with an out put of 6.4 up to 10.6 Cfm They can be equipped with an electric motor, Honda gas engine, or diesel engines for portability and off grid needs. Depending what type of tanks you are filling the fill whip hose can be shipped with DIN300 with scuba yoke, CGA 347 (scba), or female foster fitting for filling paintball tanks. the W32 Compressors include two fill hoses, but can be expanded if needed.