Stephenrc45 post a few more pics of your M53. I think what you have is an M53 with some German parts on it, the bipod for instance is similar to my MG42. Is the WaA on the receiver the only German marking on it?
On the subject of fake MG42s, I doubt that anyone is faking MG42s in the UK for several reasons:
1. there would be little, if any, money in it. I have said before that the price difference between the M53 and the MG42 is about Â£500 and once you take into account all the work you would have to do to make it look real then there is little money left over. You may as well buy a real one and try to sell at a high price.
2. once you have your faked gun you have to sell it and I don't think the marked is that big for this type of thing, especially in the UK.
3. When they are deactivated the serial number, model type and country of origin are recorded on the deac certificate. So now you have to forge the deac cert as well.
Lots of risk for bugger all money really. Now accessories, on the other hand, is a different story they are frequently over priced and have misleading descriptions etc.
The only thing that helps me maintain my slender grip on reality is the friendship I share with my collection of singing potatoes.