Glock 17 Gen4 GBB Airsoft Gun, Best Glock Accessories

looking to begin modding the internals of my CO2 umarex elite force glock 17 gen 4, looking for help knowing what parts are best to upgrade first any help would be awesome

Elite Force GLOCK 18c Gen3 Gas-Blowback Airsoft Pistol w/ Extended Magazine, SS Airsoft

SRU Umarex Glock 17 Gen 3 / 4 GBB PDW SMG Kit (Black)

Accessories & Parts - Gas Pistol Parts - Glock Parts

Umarex Glock 19 Gen 4 GBB Airsoft Frame (Parts # 03-1) by VFC

Elite Force Glock 17 Gen 4 GBB Airsoft Pistol (CO2) - GMI Airsoft

GLOCK G45 GBB 6MM Blowback Airsoft Pistol

Gassed Up Player Package #27 ft. Elite Force GLOCK 17 Gen 5 Gas Blow Back Airsoft

EMG TTI Combat Master G34 JW2 GBB Pistol Alumium Slide Ver. ( GHK Glock 17 GBBP System ) ( John Wick 2 ) ( Grey )

Tokyo Marui & WE Tactical Glock 17 GBB Parts

Airsoft GLOCK GBB PARTS – SIXmm (6mm)

Best Glock Upgrades [Hands-on]: Defense, Competition, & Custom - Pew Pew Tactical