Way back in the day, we tried to set up a group of EE specific Arbitrators - to deal with disputes. It fell apart quite badly. I will not go into details, but note the "XMU" in my title stands for "Ex Moderator Union".
Buying and selling here is buyer beware.
It's been said many times, buy the rifle, not the story.
It doesn't matter if the seller claims that the gun was owned by TE Lawrence himself, don't look at the tale, look at the gun. Winston Churchill had a Mauser C-96 in the Boer War when he rode there with the Cavalry...what's the likelihood that it was one of the 9mm ones? The rifle owned by Louis Riel during his rebellion - how could it have been a Lee Enfield #4? How could that #4(T) be correct with a Savage Receiver, and a No32 Mark 1 telescope? What do you mean this No.22 telescope is from a prototype Bren Gun mounting? How do you know this MG-08 was captured at Vimy Ridge?
Buy the gun, not the story.
I don't know diddly about Mausers, but had a number of them pass through my hands this year on the way to an auction - it made me realize that I don't know much about Mausers at all.
The prevalence recently of reproduction parts and equipment associated to military surplus arms is...distracting...from the honest buyers and sellers. I was in the US at OSHKOSH a couple of years ago and the military re-enactors had a display setup. It broke my heart to tell the guy at the British display that his #4(T) was a cobbled together Chinese repro scope, plus a Savage Enfield with a set of pads that were clearly NOT original, nor did they have the correct screws or staking marks...he'd spent quite a bit on it too. I felt bad.
I am...selective...about the rifles that I buy now. I'm past the days of needing to buy one of everything. I buy what I want, and am selective about it.
Don't be afraid to pass up a 'deal'...the EE isn't quite as bad as the used car section on Kijiji, but you have to know what you're about when you buy something.
NS