I have 2 Glock17 gen5 T4E magazine and the punch pin or Bumper pin are damaged and need replacing otherwise it a new magazine and the not cheap.
I have searched the internet email Umarex USA , Germany no reply Umarex France said they only deal with French customers.
Have managed to get two only but there in instructions on how to replace them or any Schematic on the magazine, have dismantled one magazine but waiting when the pin arrives see if there a thread or push fit.
Reviews I seen on the net on the co2 leaking and it a common problem the pin gets distorted and leaks and yes I checked the green seal it fine but do have replacement seals.
can only reams to put one image on but i do an other post with the damaged one.
thank you Paul