M9 mags unable to get out pin for leakage fix

[Neurotrauma]

I have tried everything, the gun I am using is unfortunately a "GAS" model (theyre on that airsoft tigerhk site, I was duped into thinking it was a TM when I used ebay, my first mistake) M9, I am using their stock mag as well as a TM m9 mag, both of which have the same issue. Where everybody shows diagrams and videos of where to knock out the pins to remove the buttplate the pins are hollow, nothing is catching on them! I've tried allen keys, mini screwdrivers etc, putting it over the pin and hitting it with a hammer, as demonstrated pretty much everywhere I look, but i cant even get a millimeter of give out of it to get pliers in. Is there any special trick for these hollow pins? anyone else dealt with this before? I assume they have as tm's are popular here but I cant seem to find the same problem

please help!

[Drake]

Use the appropriate sized pin punch.

[Neurotrauma]

I imagine that would be around the 5/32 size? I appreciate your help, Id rather just buy one tho then buy a whole set for like 30$ that seems to look around the right size.