Spring and follower would bind up at 16-17 rounds. - Tyrant CNC H&K VP9/VP40/P30, +5 Rounds Magazine Extension

Broke before I could get it to work. Tried every configuration i was able to try. Tried the included spring, new/old oem springs, with/without the plastic oem piece in the bottom. New/old 15rnd mags. The retention pin on the baseplate got worn just from me taking it off and putting on trying to make it work so it wont even stay on even it i get it to work. Paper weight as it is right now. Tyrant still hasnt emailed me back after asking for photos and information about my gun build. Didnt work for me at all.