Umarex New Version Piston Base Assy For Umarex (VFC) G17 Gen 3/4 (# 01-11)

Umarex New Version Piston Base Assy For Umarex (VFC) G17 Gen 3/4 (# 01-11) Metal Blow Back Housing & Polymer Loading Nozzle Design For Replace the Original Parts (# 01-11) Suitable For Umarex (VFC) Glock 17 Gen3/ Gen4 Series Airsoft Gas Blow Back GBB Pistol Airsoft Guns