So I ended up pulling the trigger on buying the airsoft quad rail from Taiwan, was 92.50 + 12 shipping. I'll post pics when it arrives. Until then I found this as well as another option. That came today and have to go to my gunsmith and see how it fits as I am getting a J-comp put on it. https://botach.com/ergo-universal-picatinny-rails/
So it finally arrived today, still waiting for my upper to be finished at the gunsmith. Initial impressions are that it feels very well made, solid. I will have to remove thw the takedown pin from the original one as this doesn't come with. Until then ta dah.
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Nice! Can we please have some more photos of this (front view, disassembled view, etc)? I'd like to see how well it's constructed around the area where the piston's vent holes would be.
Ok, so here's the skinny so far. It is going to need something to hold it together as it doesn't have the same kind of detent spring as the stock handguard. I suspect something like the one used on the other handguards listed here with the 2 cotter keys to hold it in place. If I figure out a more solid work around I will post. Until then not going to be able to install it.
Another issue I have run into is the lower guard does not fit into the retainer as it is too thick at this spot and will need to be either milled/filed/sanded down a little bit, looks like about 2mm might do the job, can't go too thin here as the rail here is not very thick.