I am installing a new gas block on my AR rifle, being the knob that I am I have forgotten how to determine which front sight height(low profile, standard, high) I need.
I am installing a "Yankee Hill Machine Low Profile Gas Block".
That will depend. Do you have a flat top, detachable carry handle, or fixed A2 handle? Measure your old FSB and find out what you have. And don’t order a plastic one.
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