I have a CA M15A4, I got it from Zorks.com for 270.00, I had problems with the first one I got. It had wire problems, hop-up wouldnt work. But it look great!!! I bought a Guarder aimpoint, but I need a high mount. I dont like how its sits as is. Too low, in fact I wish I would have just got the ACOG replica. Anyways I new too, so dont listen to a word I say.