ok its is finally off, and here uis my story of how i did it:
ib tried to take it off with everything that you could possible name by unscrewing it, but we had no luck. so..... we put a thin piece of metal through the gaps and turned it, this broke about 5 of the prongs off lol. so next we decided to use a woolworths workshop engraving tool LOL to make a flat surface to grab it with a spanner, guess what.... no luck. so we drilled a hole through the remains of the top section and put a screwdriver through the hole and turned it as hard as we opssible could, it strated to undo the main feedneck thingy in the gun, that was wrong, and the screadroiver broke anyway.....so we tried to cut it with a hack saw down the side and after realisibg that that was very very dodgy lol we decided to use a different method..this was to drill a line of holes down the side of the feedneck so that we could just bend it off, once the holes were drilled we grabbed it with a pair of pliers and the feedneck broke off FINALLY IT CAME OFF!!!!. we found that it was loctited on lol but anyway it is off now ready for my cp feedneck. and i am happy, after 4 hours of work it is off LOL
i will post pics of the mangled feed neck asap as it is sooo funny, hope this gives you a laugh guys