It's an airsoft rifle. The SUSAT is far from real too! It's too small. Has the wrong colour mount, is missing detail, such as the sight adjusting screws at the front, the rubber eye piece, the rear Emergency sight blade....shall I go on?
The weapon looks unused far to much protective finish on it, and the susat, the only time you see a weapon like that is when you get a replacement for a weapon that has been written off. No rubber eyepiece on susat. Could be my old eyes but the mag on the weapon looks to long and is sat at an angle ? No dust cover. These types of things can be bought from airsoft. This does not look like a real L85A1 to me.