I just picked a DTI (Del-Ton Industries) M4 Nice little gun for the price, I paid 599.99 on sale so I couldn't refuse and I needed an M4. It came with no rear sight so for now I just mounted my Matech BUIS, its the same sight that was on my issue US Army M4. it kept hitting way right, I had to bring the rear sight all the way over to the left to get it on target, took it back to the shop and they said its the Ft Sight/Gas block and I should have it back in a few days, still waiting. My point is, has anyone else ever had this problem? I guess the front sight dose look tweaked, but I don't know.