No once they start to leak you take apart the mag and put some silicone oil on the affected part or possibly head over to Home Depot or Lowes or whatever to buy an O ring that's the right size (they should come in packs of like 5 or 10 and cost like $5 which is a ripoff if you ask me).
Here's a youtube video about how to do it, haven't watched it through but it seems like it's well done and explained and plus the guy doesn't sound like he's 12 years old so probably isn't talking out of his ass
YouTube - Airsoft Gas Magazine Leak Fix