i have one on my svd, works well. i was able to zero it really easily. annoying the first few times you put it on. its REALLY tight on the rail.
to save yourself a whole hell of a lot of annoyance and scratches on the body of the gun, you will need to file down this part...
its a little too low, and scrapes across the body when you try to install it.
other then that, i have no complaints