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Put your comment in the form of a question. That will draw attention to the issue without pointing a finger. If he answers your question untruthfully, you have better ground to call him out on.
If its a glaring mistake like, "buy my .308 win glock 26 that shoots .0001" groups and interchangeable .50bmg barrel" sure, tell them to correct it.
if its opinion, "my hi point is the best gun ever made" then myob.