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to anyone who is knowledgeable thanks in advance . im going to buy a flat top upper. i have a a2 upper now im going to keep the barrel and hand guard and replace the a2 with the flat top. my questions are i need one of those thing that hold the upper in a vice ?what are they called ?and where can i get one . the other question is when i put this back togather do i need one of those things that look like a bullit thats a go or no go . or does it just bolt all up . im sorry about these questions i just dont know. i need the flat top becouse i need a better scope platform im getting older