20 MOA Scope Mount on AEA Element Max .58 or Zeus .72?

Hi All, I just bought a new Arken scope for my AEA Element Max .58. I ended up selecting the 20 MOA scope mount without knowing what it was. Now I know what it is, and I am wondering if I should keep it or return it for a 0 MOA scope mount. Any assistance would be appreciated. I read on a firearm scope website that one would only use a 20 MOA scope mount if they were shooting more than 400 yards. Well these PCP air guns are not firearms, so I'm not sure if that advice would apply to my AEA rifles. I won't be shooting at anything (deer) more than 100 yards. Any information you could provide would be appreciated to help me make the decision to keep it or send it back. Thanks.
 
If you run out of elevation at your zero distance you will need one. For some reason the Korean guns need them (and to clear the rear iron sight too). I have them on all Seneca/Careers that I own. Actually the guns came with them from the previous owners. I tried to eliminate them, only to find out my elevation was maxed even at 20 yards. One time the 40mm AO bottomed out on the rear iron.
 
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