Quoted:
Hey N_Viejo, I just answered your IM about this subject. There are two issues with mounting a scope to an AR15. The first one is height. Generally you need extra high rings to achieve the proper cheek weld. The second is being able to mount the scope forward enough. Here is a pic of a scope mounted over the HG's:
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See, now this confuses me...when I was in the gun shop, they had a few scoped A3s on hand. I thought the extra high mount gave a shitty cheekweld. The "high" was about right, but still a little too high. They didn't have any mediums mounted for me to try, but I bought the medium anyways, because it was lower than the "high" which was a bit too high. These were all Millet rings, I believe.
This is a pain in the ass...trying to make a decision like this without actually trying it out. What's your return policy like C4iGrant?
-Nick Viejo.