This is an AWESOME product. This is the 3rd edition of the REM - this one works in bright daylight. This is a NIB REM3 with an RED colored LED. It fits into the stock white ring sight on a PS90! It fixes the sucky stock sight that comes on the PS90! Here is a link to a detailed review of the product! FN Forum.NET PS90 FS2000 FN SCAR FiveseveN 5.7x28mm FN Forum.NET :: View topic - Reticule Enhancement Module T3 (Orders) The LED attached underneath the PS90's ringsight and attaches to the receiver. It fits very nicely. The REM 3 costs $79 + shipping. I am selling it for $65 shipped! - It has never been used! E-mail me at: firstname.lastname@example.org to purchase it! This is advertised on more than 1 site - so please e-mail me.