Have you used the ZCO 5-27?
Do you feel the gain in FOV is worth the trade off of mag? Any other notes on glass, light transmission, etc. you care to speak to?
I ask because the 4-20 is seeming more and more like the better choice since I rarely go over 20x unless I'm trying to "spot" or view groupings, etc. I mean, I do use over 20x because I have it and the lever doesn't stop at 20 but I'm fairly certain I wouldn't miss it in competition and it may actually improve my performance with the larger FOV and less mag when you*/I are in the moment and just grabbing magnification on the clock.
*I mean 'you' in a general sense, not you specifically.
And one more time, That rifle scratches my itch. If you know what I mean.