This sight is made for ars with fsp! - Matech Top Mounted Deployable Iron Sight

Please by this if your AR has a FSP. There are many other to buy but this and the KAC rear sights are specifically made for a FSP. If your here from ebay seeing all those deals just buy it from here you know its legit and its brand new. I was in the same boat. Ask any vet that has used a m4/m16A4 varient they will sear buy it i know i will. Cant go wrong also. The "my screw latch broke from tightening it". Well probably over did it. Like anything mechanical read the directions PLEASE! Yes they sell replacement parts not sure if they do on OP but read the directions and youll be just fine.