I'd just like to take a second to brag on the HHA OL 5000 single pin sight. It was a bit of a job finding the correct tape to use but when you get it, it's on dude. The windage adjustment is very easy and you don't need any tools whatsoever to adjust the sight. The pin is super bright in low light conditions and if you put the pin on 30, it's dead on. I've found that you can leave it on 25 and hit anything in the vitals with a 15-30 yard shot. I'm just saying that I like it.
