Requires pin - Ballistic Advantage FSB F w/ Delta Assembly Top Mounted Fixed Iron Sight

Purchased without prior research. Building an A1/2 replica and picked up this integrated gas block/front sight. Perfect fit on the barrel, however, this requires a pin to hold in place. I was mistaken in thinking this was a "clamp-on". The hole in the block is not threaded, and no set screw is included. Had this been included, I would not hesitate to pick up another. The product is very well made, unless you are willing to drill your barrel, I'd look elsewhere.