Eject88 shows you how to maintain you gas magazine without opening it up in this video. It seems like he did this video in his underwear... "My version on how to maintain your magazines without disassembling them. The goal is to keep the O-rings and rubber gaskets lubricated with silicon oil. Here I use Abbey's products: The silicon oil 35, and the Predator High silicon oil percentage in the gas, container. Hopefully the predator maintenance gas will do the job on lubricating the inside O-rings and rubber gaskets of the magazine.

In this video I do not show it but use some silicon oil to apply a thin coat (better if you own a silicon oil spray container) on the top of the magazine at the rubber gasket where the gas enters the bolt to the main airgun."