WELL PRO GBBR NEGATIVE PRESSURE ADJUSTABLE SYSTEM (NPAS) RISER Description: The Pro-Arms aluminum outer

Description: The Pro-Arms aluminum outer barrel for the SIG AIR P320 M17 is a threaded barrel designed to facilitate the mounting of suppressors and compensators

Inner Bore Diameter: 23

UNIVERSAL 10MM FIT: Specifically designed to be compatible with standard 10mm airsoft gun sockets for a precise and secure fit

this chemistry dramatically reduces internal resistance

complete with deep-engraved markings on the receiver and dummy barrel extension

WELL PRO GBBR NEGATIVE PRESSURE ADJUSTABLE SYSTEM (NPAS) RISER Description: The Pro-Arms aluminum outerFeatures: NPAS allows players to adjust muzzle velocity (FPS) Polymer construction with steel screws Compatible with Well Pro, Prown series GBB rifles, including M4, AK, PPK, etc. VFC style design; refer to VFC installation guidelines Attention: Screws on the bolts of Well Pro and Prown models may be thread locked. Please use a heat gun to warm them first, or you may strip the screws