I am planning to purchase a 14.5" midlength Light weight upper from BCM. I have a local smith who can shave down the the FSB, but what I need to know is if the FSB can be removed with a pinned on flash hider? I know the diameter of the light weight barrel is smaller than the gov't profile barrel. I am planning on using a Battle comp 1.5 flash hider. Should I wait to have the flash hider pinned until after the FSB is shaved down? Is this legal if I wait to purchase the lower till after the upper is pinned? Thanks for your help.


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