I posted some pictures below to show the ammount of material that had to be removed to install the rail using the YHM front sight. As fas as the quality of the sight.. It has a pivot pin that is prone to walk during firing, I fixed this problem by staking the edge of the hole on each side to capture the pin. I changed out the mounting bolts for stainless steel hex head bolts and tiny stainless lock washers and they have yet to loosen at all. This gun now has a 1x4 scope on a Larue mount and I like having the front sight folded completely out of the way when not in use.
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