You didn't order the wrong barrel, you simply misunderstand how these things work. You're not going to find retailers selling barrels pre-drilled for a FSB that isn't already installed. Each FSB and barrel is a unique pair because they are drilled together to accept the pinning.
Anyway, pick out the fixed FSB that you want, and ship them to ADCO to be drilled and pinned.
Your barrel is dimpled for users who want to use a set-screw, low profile gas block.
"I have your number. Consider yourself warned."
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