Slightly Larger Sope Rail Mount

[Appleseed]

I am using a nikon 3 x 9 and it fits well on a top rail. Will a similar 4 x 12 vortex diamondback fit similarly? (Striker old style)

[Fuj']

You would have to check the objective size of the Vortex and how much barrel
clearance is available you already have. You may need taller rings, or may not.
Speaking of rings.....Make sure the tube diameters are the same. Look up the
scope. They will list all the specs you need to see.