I bought one several yrs ago.... came with the supplied pic rail clamp. The pic rail clamp would not hold (iddy biddy little screw) at any reasonable torque level on my 16lb braked 338 RUM. One trip to the range & it would slide forward.... the Unit didn't sit level in the clamp, which was annoying at worst. I ordered the ring mount thinking "it can't be worse, right?" Wrong, I open my reasonably priced package to find an aluminum, pot metal casting of a ring worm turd.... I think a mount made of Lego's would have been stronger

Then I find out that the clamp bottoms out before it engaged the dovetail of the ASLI.... to the DREMEL you go!! Yeah it worked, but after discovering the
FlatLine Ops, the Horus has went down the road...
The ASLI was pretty well made, the mounts on the other hand....