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Stainless 303 extended nozzle head and spring. 

Note: please make sure your hop-up unit is OEM spec otherwise would cause some chopping problem.

Best recommendation use on HAO advance one-piece cylinder with minor tolerance and best air-tight! Competible with Systema OEM cylinder. Other third-party cylinder don't recommend.

Enhanced Stainless Steel 303 Nozzle head

SKU: O14