Ncstar flip-up front sight-----model # marflf - NcSTAR Top Mounted Deployable Front Sight

Be aware of what you are buying when you by this sight. Look at the model number and read the description. It is designed for application on a lower height gas block. I own a DPSM Oracle AR15 which has a railed gas block that sits about .25 inches lower than the rail on the receiver. The rifle came without sights. The manufacturer sells a sight for $50+ that is not a flip-up. A sight that compensates for the height difference is not real easy to find. There is no way to zero this sight (#MARFLF) with a standard rear sight when applied to rails that are at the same level. If you have questions about whether a sight is appropriate for your application call the manufacturer and talk to customer service or technical services. For me, this is exactly the sight I needed for the lower gas block, and it has worked very well. It maintains zero after it is flipped up from the down position, and when not in use it folds down out of the way and ready for backup duty.