Picatinny Rail for Marui P90

Hi everybody,
This piece was designed specifically for the replica of the P90 manufactured by Tokyo Marui. This replica of P90 is equipped originally with a Red-Dot, which is not really effective because too small.
So I designed a rail unit incorporating a sight and a Picatinny rail for mounting of accessory sight.
This block contains the original replica of the fixings points, but not integrated bores to fix the rail on the side. I left the front face empty on this version to let you place y