New Nightforce NXS 5.5-22X50 Bought it a few w. When i went to set the Zero Stop weeks ago noticed there was no longer the screw slot like my other 4 NF's Looked like a deep hole with something that looked like it might be an allen wrench adjustment. Called NF and tech fumbled around, sounded sort of surprised and said we change our design. Does any one else have this sort of set up or do I have a problem?