I'm looking for a scope that I can use on my AR and Ruger 10/22.
The spotting scope should have a 45deg angle and a 60mm to 80mm objective.
Stay away from cheap - you're only going to be wasting your money. There are a number of moderately priced riflescopes out there of reasonable quality. You can find these with brand names like Tasco, Bushnell, Simmons, Barska, BSA, etc. Check out what each of these brands offer. I would generally avoid their lowest-priced series scopes and work up from there. You should be able to find a decent, moderate-range variable scope (3-9x40) from any of these brands for under $100 without buying junk. You're not going to be getting Leupold or Nikon quality, but you're not paying those prices either.
Almost the same advice holds true for spotting scopes, although they aren't subject to the same rough-house handling as riflescopes. Again, you can get a decent scope for around $100 or a little more. What you're going to give up on the moderately priced spotting scopes is image resolution and clarity at the higher magnifications. This is because of the quality of the optics, so I wouldn't bother with scopes that offer the 60x-90x magnification range because you're just paying for a power range that isn't worth it.
I have been very happy with my Celestron Ultima 65 Spotting Scope. It is an 18-55x65mm zoom scope with a 45-degree angled eyepiece. Celestron doesn't get a lot of publicity in the shooting sports, but they make several models and they've been making quality telescopes now for several decades. I've had this one about three years and use it constantly at the range. Been very happy with it. As mentioned above, resolution gets a little fuzzy on long distance targets at maximum magnification, but up to 40x, it's very crisp.
Hope this has been some help.
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