CERTAINLY you can use them to co-witness, you just do not have the same if any magnification (which is ok). C-W is common, in fact if you buy a good quality telescope you will find on the side of the scope there is a smaller scope its to be able to find the target area and then look thru the more powerful scope to home in on the target.
This is the purpose of your c-w, find the target area then look thru the more powerful side. If you numbered your sights the the lower or no power c-w is 1, your magnified is 2.
What is important is that your CW is parallel to the long (horizontal) AND the vertical axis of your scope. Height: Not as critical as your field of vision will be larger with your CW. It does not need to be at the same height, it will be within acceptable parameters mounted on your gun.I thought so. The person I talked to said it would only with an mbus PRO hard sight set which was $$$$ for my pocket. I think he was trying to get into my wallet. Now, I have the truth can you help me a little further? In order to achieve a co-witness my scope needs to be raised up a little higher. So I'd need another base to acquire my c/w. So how do I measure to get a correct scop base?