The entire assembly should look like this on the inside of your gun. (if you have a rubber bumper or buffer, it should fit around the spring and inside the lower tube of your gun.)
Note: The striker should have a hole in it, the hole should be facing the rear of the gun and the flat part of the striker should face downward.
Spring should fit inside the striker, like this:
For stacked tubed blowbacks, the thinner the lubricant the better, is what I have heard. So oil is the way to go. Coat the striker with the oil but don't use so much the it is dripping off of the striker.
If this isn't what you're referring to, please let me know.