Laylax shows you how to install the P90 Stealth Upper Receiver from their Proto Gear Arts brand released on a limited run. This lightweight upper receiver features a bold top cut similar to the popular XF50 Tri-Rail, offering optimal sight height and side rails for accessories. A magazine guide slider improves reloading, and the construction utilizes lightweight, rigid nylon resin. It comes in two versions: a Picatinny Rail Type with three rails and live charging handle (around 270g) and a lighter M-LOK type with M-LOK slots and no charging handle (around 230g), both significantly lighter than the stock Tokyo Marui P90+ upper receiver.