Very nice gun Render. King Arms MRF-MX is in my opinion one of the best replica rails out there today. Short mag looks great, I think I will get some for my Magpul AEG.
I own a few TangoDown rail covers. The TD ones are thicker, and slightly longer by a few mm, and made from a stronger material.
These rail covers cost $25 a piece.
KA replicas are pretty damn good, tough and durable, best part.. it doesn't cost an arm or a leg.
Here is an update of my blasters.
Work in progress, got rid of the KA LaRue 9.0 free floating RAS. Waiting on the Mad