the gunbroker mount and the one from scopetica look on in the same. I'ld avoid them. Lumpy's mount looks like the Action Arms style that I also own, in addition to the military ones mentioned previously.
AA was one of the importers of the Galil, after Magnum Research. When I had purchased my rifle, I couldn't, at the time, afford the Isralie military mount. The AA mount is made of high quality aluminium. It is secured by a steel dove tail in the gun's reciever, and to that, with 2 set screws and a thumb wheel, about 1 1/4" diameter. The t-wheel is mounted onto a 1/8" threaded shaft which goes into the dove tail. It is over the bore's center, and has an iron sight channel. Do not consider this mount to be a "quick release". Even though it is presented as such.
If you must buy cheap, buy this, around $150.
Instructions are not provided for this mount, and I cracked my receiver installing it. If you get one, post the info and I'll tell you how to avoid that. Hindsight is great as a learning experiance.
How much are you paying for this gun?
Buy the high quality military mount!!!! Or you will probably by twice like I did!
When I get a digital camera, I'm going to put one or both of my Action Arms mounts on e-bay....The Original Military Mounts are steel and well made. They are keepers!!