Anyone have experience with mounting a scope to a CZ 457 LUX.? This is my first attempt but to me, I only have 2 options as one of the scope mounts has a stop pin and I only have these 2 options to mount it which although can be very tight and solid, just appears to be hanging over the front and rear of the rail. The rail has 4 spots for the stop pin but the other 2 are not options. Or do I simply need a Picatinny rail? Hope I am making sense.