If it is a Parker shotgun, it is a Trojan model, not a 'Titan.' If its a Trojan, the barrels should come off the receiver after you remove the forend, held tight by a friction fit. Don't use any tools to try to remove the forend; sometimes something dull and blunt like the handle end of a tooth brush can help lever the tip of the forend up and won't mar either the bluing on the barrels or the forend wood inside the tip.
If the barrels don't rotate easily off the receiver, you have other problems: probably the cocking slide inside the receiver is not travelling its proper distance, unhooking the cocking hook on the lug of the barrels, which releases the barrels. Nine times out of 10 this is a result of congealed grease, oil, dirt, and other gunk inhibiting the correct travel of the cocking slide; in rare occurrences it may be a broken return spring in the slide.
If by "pin" you mean the main large screw head in the joint roll or break (where the receiver meets the forend), DON'T try to remove it - the joint roll and accompanying screw is a press-fit unit requiring tremendous pressure to remove (usually by using an arbor press). Trying to remove the screw only will result in a buggered screw head, guaranteed.
Try releasing the hammers (fire the gun) with the forend off the gun; this usually releases enough spring tension on the cocking slide to disengage the cocking hook on the barrels; if this doesn't work the action needs to be disassembled, a job for a gunsmith who is familiar with the Parker Gun, not a job for amateurs. Hope this helps
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