SIG Sauer Proforce Spare Magazine For P320 M17 MHS GBB Pistol - CO2 - Tan CO2 Pistols and Proto loader

and Proto loader

A revolutionary new spool valve design using Breech Sensing Technology and a unique pneumatically latching spool to accurately control the exact amount of air released for each shot completely independently of the solenoid and the dwell time

but appears to be done poorly or it is simply coming off

managing partner of UMAREX

SIG Sauer Proforce Spare Magazine For P320 M17 MHS GBB Pistol - CO2 - Tan CO2 Pistols and Proto loaderFeatures: Metal alloy construction Compatible with 12g CO2 cartridges 21 round capacity Specifications: Compatibility: SIG Sauer Proforce P320 M17 MHS GBB Pistol Magazine: 21+1 rounds Gas Type: 12g CO2 cartridge