are they adjustable or are they fixed mounts, reason i ask is my wife bought me a 4-16x5o scope and it doesn't fit on the rifle, the scope ringes are either to close together to fit on the optic correctly and won't mount to the rifle ie. the front ring is back towards the bolt and not in the groove in the sight base. if i have the rings mounted on the rifle the spacing is so far apart that the ring is to far up on the scope and is right where it starts to neck up towards the objective. i was wondering if i can move the mounts on the rifle around to make it fit or just return the scope and find something else that will fit.