If you can't get it apart, put it on an anvil and give the top a good whack with a hammer. The cheesy zinc-alloy pot metal should split down the center after the first smack.
No need to check if it's loaded or not, being that with a Raven, it's relatively safe to stand in front of it.
If you see any gunk inside, take a blow torch and burn it out.
When you finish this step, take the peices and tape them back to the original configuration (of a close proximity thereof).
It should be just as reliable, if not more so, than it is now... and you'll have a clean Raven.
Oh, geez... ok. I just had to jump in there. If you had a Davis, then I might have become sarcastic. I personally have a Davis P380 that stripped its rifling after 200 rounds of Hansen 95gr JHP.
seriously now
If it's anything like my Davis design-wise, and I think it is, you will have to remove the magazine and make sure it's unchambered. Pull the trigger to make certain the spring isn't under tension.
On the rear of the pistol should be an "insert looking thing of different metallic color". Maybe it's called a firing pin channel plug, who knows.
Once located, depress it as far as possible with an item such as the tip of a pen. While depressed, lift up on the rear of the slide.
The rear of the slide should seperate from the pistol and the "insert looking thing of different metallic color" will slide out the rear of the gun (possibly flying across the room, along with your firing pin spring). It will be under slight spring tension, so don't put it up to your eye or anything.
Slide the slide forward along the barrel and it will seperate completely from the frame. This will allow you to remove your recoil spring and clean your chamber area, trigger bar assembly and inside the slide. Be sure to clean the 20+ years of gunk from the firing pin channel that you should now have access to (tilt the slide facing up to allow the firing pin to fall free if it hasn't already).
Reassembly is in the reverse order.
Replace the firing pin and spring in the proper location, along with the "insert looking thing of different metallic color" (which will be under spring tension once inserted). Slide the slide back over the barrel and depress the "insert looking thing of different metallic color" while seating the slide to the frame. Once mated to the frame, allow that damn thing of different color to set back... it should catch.
Good luck.