As title states, what do you use to build your upper? Clamshell, Reaction Rod or Magpul BEV Block? Note that the upper will have to be heated up pretty good as I will be using a Bravo Company Lower and they state they are tight to begin with (on purpose) and the one I have is in fact is very tight, as even a upper w/ a standard m4 extension would only go in 1/2 way before heat was applied, so if that is a consideration, please let me know.
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What do you use to build your upper?
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