I have them, now sitting in one of my unused parts boxes.
To answer your question... I believe mine came with destructions on filing the ends down to fight tightly.
To agree with everyone else. They are not needed and that is why this setup is sitting in a parts box and not on any of my rifles. You'll run them for a while and then decide to take it off, probably.
Anyway, hope this was informative in your quest for knowledge of fitting these "Anti Rotation" pins, and in letting you know that you wasted money. Bet hey, they do look cool.
Live and learn brother.
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556mp

