G&P Full Metal Frame for Tokyo Marui, Echo1, Classic Army FN P90 / P90TR

"That is a big NEGATIVE on the red dot coming with it, but if you have one, it'll fit right on no problem, or if you get one with a P90 just use that one. Solid metal will give you a good balance of weight in the P90 which is a bit of an issue for me, makes fine snap-to aiming a little hard since it's so easy to turn with a plastic frame. Metal will make it heavier, beefier, and stronger which is good, good and good.