I just use a dab of superlube on the bolt bearing...then shoot a mag or two of oily gas through it now and then. Dry gas might be better for the hopup performance...but the seals in the mags love to have some oil.
NPAS Kit pics
Adjustable valve, crunched nozzle (lower), stock nozzle (upper)
Adjustment tool/valve
Adjustable valve (right..partially unscrewed) and stock valve
Different lengths of threading on stock SCAR rod vs. RATECH NPAS kit rod
Homemade spacer
