The 2.5-20 and the 4-32 are practically identical in weight. Both are in the 28oz range.You're right the 4-32. My gun smith loves that scope. But it doesn't meet the criteria. The eye box in the 32 is significantly better than the 2.5-20. It is also significantly longer and heavier. Over 30 oz if memory serves me correct. Like the Kahles 6-24 vs the 5-25 they are completely different optics.