They have scope mounts that are made to be removed. A lot of the NV thermal guys use them so they can glass with the optics with out holding the gun, then put it back on the gun, and shoot.
My buddy had one and we didnt have any trouble with it. Would I trust it to take 600 yd shots... probably not. We had no trouble with taking it on and off and shooting hogs at less than 200 yds.
You will probably need a picatinny rail set up on the rifle to get started and build from there.
Remember cheap is just that... cheap. This will not be an item you want to buy on the cheap from Amazon. If your a $100 scope guy... the mount will cost more than the scope.
Mount ’Em Up
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