Ruined with rocksett - BUSHMSTR 90026 XM-15 300BO 16IN MINIMLIST UPPER

Do not buy this if you want to make any changes or improvements to it like replacing the hand guards or flash hider. Everything is bonded with Rocksett and cannot be removed without damaging or heating the metal. I'd return it if I could but I doubt they take it back after I tried to remove the flash hider. I've never owned an upper receiver that I could not at least replace the flash hider. They might as well have just welded everything together. Very dissatisfied.