Quick update regarding the real steel Daniel Defence rail fitted to a WE L85... The process is a fucker so figured I'd share what I've learned so far:
The WE adapter isn't needed, the DD rail slides into the slots however there is nowhere for the angled screw on the DD rail to screw into on the WE L85. MadBull replicas have the hole at the bottom, where you would screw the rail to the adapter.
The WE gas block seems to be absolutely useless and will need to be replaced as there's nowhere for the sling screw to go through, although in theory you can have it hanging under the block but I'd prefer to have it going through said gas block.
I've 3d printed a temporary gas block that works "well enough" but has no securing points. Could drill a hole through it to pin it to the barrel like the original gas block was, but it's a whole bunch of guess work.
Currently have an Army Armament L85 gas block en root from HK as it looks to be the most similar to a real steel gas block. Once it arrives, I'll update this post with if it's any good or if it needs modifying etc.
Edit: Just received the AA block, also shout out to tiger111 for a really quick delivery time. The gas tube needs some modifying, as does the rail (Only ever so slightly) to accommodate the new block. Going to have to make an alternative way to attach however, as there's no pin hole on the gas block like the WE one. I'll be setting to work tomorrow getting it modified with the hopes of a rifle ready for Sunday... 😂