I bought this to replace the original upper on a Tokyo Marui P90. I thought it had a cooler look than the pic rail that comes stock and and also wanted a red dot. That being said I does look cool but it's kind of a cheaper red dot. It works alright but the opening is tiny and the windage and elevation adjustments are awkward. Also it did not fit perfectly on the Tokyo Marui. I had to file down the stock receiver catch housing from the inside and glue it into the new receiver as this model does not come with one and the one from the Tokyo Marui did not line up with the inner barrel holes on this receiver. If you are able and willing to do the nip and tuck mod it will fit though.
