I didn't know that ammo , modifications,optics, are all the same question,like I said I'm really green,sorry to have irritated you though..Only reason I'm asking in diff threads is that diff people answer them. Any way thanks to Google it's a flash hider I want.not a suppressor .lol Now I just need to know why that guy looked like he cut the top of his barrel off and crowned it then threaded it.Also the photo of the SU16FX in the Vault mag would have an 16 inch barrel since all the other ones shipped into Canada had 16 inch barrels. So wouldn't that make the hand guard a look a little to short? I really like the hand guard on Sayomans Su16 ,but don't know if I want to try and do the cuta and mods,would prefer something that is made to fit.