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I'm getting close to figuring all of this out, well closer anyway. When I go to remove the muzzle booster from the barrel I can not get the booster off as it seems to tight around the barrel. That is what was preventing from taking those back plates off - the barrel booster was keeping the barrel from moving any further back. It sounds like metal hitting metal when I go to pull the booster off the barrel? Any tips on that one? Also on the third pic the little water release valve seems to be stuck in place any tips on that one? If someone who know what they are doing wants a paid vacation to KY for a weekend shooting to show me in person the tips and tricks on a Maxim just let me know! I do thank everyone for the help and being patient with me.

Push the booster up against the waterjacket then pull forward rapidly. You are using the booster as a slide hammer to pull the little piston, which is seized to the barrel, off the gun. If you fired the gun this weekend with the above mentioned Romanian ammo and have not yet removed it for cleaning, then it is rusted as well. The booster needs to be removed from the gun and disassembled and cleaned the same day you shoot the gun. The barrel and lock need to be thoroughly cleaned as well as the corrosive ammo has the most contact with these items. On the drain valve lightly tap the side opposite the lever with a brass hammer and see if that frees it. If not, remove the pin, collar, and circular flat spring from the side opposite the lever and push the valve out of its housing. It is tapered and will only go out the one way. Don't try to remove the lever or the screw holding it on as that will not help your problem. Where in Ky are you?

Jmann thanks for the help. On the cleaning I do always clean on the same day as shooting, but in this case my challenges in disassembly have slowed me down a bit but thankfully it is all cleaned properly now.

Good deal. The parts listed previously are the ones that will rust rapidly because of corrosive ammo. Often at shoots all I do is clean those parts with windex, then oil really well. The whole thing then goes in a pelican case with desiccant until I get home and then the gun gets a proper cleaning. That might be a week later though so I address the stuff with corrosives before I pack it up. Hot water works better but that's often hard to get at a range so the little ammonia in the glass cleaner seems to help the water evaporate faster.