These things are a great. They clip right on, seem to stay in place just fine, make sight acquisition much, much faster/easier (although the front bead/dot is arguably a bit too big), and can be "charged" with a light and will glow in the dark for a while. FYI, they fit my Hungarians and Bulgarians without a problem, but not the hooded/closed front sight on my post-ban Polytech. However, I THINK I might be able to get it to work by filing a bit of material from the bead/dot of the front night sight and/or lowering the front sight post on the rifle. Overall, just an outstanding upgrade for AK sights...especially considering the price.