Garbage don’t waste your money - Tyrant CNC H&K VP9/VP40/P30, +5 Rounds Magazine Extension

I bought four of these for my VP9 and tried 20 different ways and after 16 or 17 rounds the magazine will bind up on every one come to find out it only works on 15 round mags all of mine are 17 rounds and everyone keeps saying the old 15rd so I guess it won’t work on a new 15rd I don’t know what the difference is but one thing I do know just spend the money and buy the ones already put together or better yet spend the buck and get 20rd stock mags they have never given me any issues