A short vid of some GSG-5 rapid fire testing I did at Red Castle Gun Club. I used a mix of ammo, from Winchester to CCI to Remington, all copper plated. I achieved the best results with factory mags and CCI Minimag .22LR. I also function tested 2 Promag GSG-5 magazines, both of which fed CCI's perfectly, but experienced FTF's on the remaining ammo choices, possibly due to the weaker follower spring. This GSG-5 carbine is outfitted with the Rrages.com screw upgrade and HK91 forend, a standard GSG collapsible stock, and a custom fitted ICS SEF lower.