Quoted:
Just got one of these scopes from Bass Pro. Do I have to use the Nikon mount that is $80? Or can I use a mount thats not so expensive?
View Quote
You don't have to use any particular mount, including that one. But, it is actually toward the low end in price for reliable mounts. Your scope is no better than the strength and zero retaining ability of its mount. Don't cheap out. Mounts are important.
The thing about the M-223 mount that is an issue is not its price. Nor is it that it is not solidly constructed. It is well made and will hold zero just fine. The issue has to do with access to rear folded backup sight, if you have one. If you don't have a rear sight on the top, the mount will serve well.
But if you do, you will soon find out tbat the only way to get the M-223 mount on or off the rail is to remove your rear sight and slide the mount onto the rear of the rail. Once you mount the scope your rear backup sight has to come off to remove the scope. The inability to have ready access to your backup sights is a huge liability for me.
Most other one piece cantilever fixed mounts use two hex nuts on the cross slot bolts and a side rail clamp. Those nuts or thunb screws can be loosened fairly quickly and the scope lifted off of the rail without disturbing the rear sight. You might want to think about this in making a choice.
Going cheaper, though, might not be wise.