Xtr sig rings - Burris XTR Signature 1in Rifle Scope Rings

I like the concept of adjustability but was disappointed when the mfg. doesn't include a set of zero moa inserts, instead you end up using the 20 moa inserts to make the scope level to start with. I did call the mfg. tech support # to see if i could purchase a set of zero moa inserts and you can't. Also the instructions for setting up the scope initially was severely lacking all this type of info.