That does look like crap but I don't believe there was anything other than a flat surface to the back of that ram piston. I don't think it's necessarily bad. Honestly it might have some from the factory like that.
Since it's been a few days I assume you found TOG (Tribal Owners Group)? It's not really active but good info and if you can find some of those folks, they may have the parts. I actually have a spare noid somewhere but it's in bushmaster configuration so I think the screws were different. Haven't looked in that parts box in a while but there's a small chance I have a gasket and screws.
oh... HaveBlue (ASP) is a good one to ping as well. He used to be pretty deep into those guns and may have some bits laying around as well.
Note: While I would love to take credit for his work, I am not associated with Mad Customs!
Originally Posted by senghing27
You can contact BigMatt-MadCustoms in his MCB forum