I prefer a fixed sight over a folding BUIS. I have been using a DD1.5, and it's a fine sight, but I wanted the advantage of adjustable elevation. After researching, I decided on the Yankee Hill Machine fixed rear. I went to numerous web sellers, but everyone seemed to be "out-of-stock", including YHM. Luckily, I found a new one on eBay and I got it for $50. This sight appears to be bomb-proof. I'll bet I could stand on it like the rung of a ladder and it would still hold. For anyone looking for a durable fixed rear sight, the YHM is definately a good option.