Here's the reply I received from Meteor this AM.
Dear Jeremy,
Many thanks for your message and for your words about our products, very appreciated! We are very sorry about the inconvenience you have found, it was obviously a faulty piston sold by mistake which skipped all quality checkings, which is serious but unfortunately these things sometimes happen despite all efforts to prevent it.
As far as what we can see from you photos, it doesn’t seem that the pin was pressed too deep but that it was wrongly positioned, that is it was not inserted into the reinforcement stud / boss where it should go into, so the mistake was obviously due to the inversion of intake / exaust side during the operations of pins’ insertion.
Please check with (suppliers name removed) if they are willing to replace this piston free of charge for you. If they aren’t, please just let me know and we will see how to solve the problem.
Awaiting for your kind reply, many thanks again.
Best regards