PS90 Chop Tops with Different Sight Options
This video details the 'chop top' modification for the FN PS90 and P90 platforms by MK3 Firearms. The process involves removing the factory sight structure and machining a custom Picatinny rail directly into the receiver, creating an inset mount. This modification aims to provide a sleeker profile and, crucially, an optimal height for a proper cheek weld when mounting optics, addressing previous issues with mounts being too low.











