[lemegacool]

here, i'm going to tell you how to get to the spring without dissasembling the body...

look behind the trigger, you should see a post or some kind of pin... press it down (away from the gun) then remove the cheek rest on the stock. the just slide the bolt assembly out of the gun. now you just have to uncrew the cylinder head and the guts will come out. swap the spring and reassemble! done!