Perfect for non-F FSB
My Windham upper didn’t have the F marked FSB so my post was uncomfortably high after zeroing (gap below base). Installed this KNS extended post and the top of the base sits perfectly flush with the top of the FSB seat. Exactly what I was looking for. Thanks again. Shipped fast and their front sight post tool had the perfect tolerance for easy adjustments, no awkward wiggling needed to turn. Tanner
