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dont know that particular scope but the Canadian C3 had a Kahles 6x,42 and it worked just fine ,,, (fwiw - the Canadian military has always been pretty particular in their selection of optics) I have an older 4x Kahles steel tube on a Model 1950 Mannlicher Schoenauer and it has been excellent in holding zero. AFAIK Swarovski owns Kahles like Zeiss owns Hensoldt and I got the impression that Kahles was Swarovski's "industrial" version targeting military clients as Hensoldt was Zeiss's military brand. Although I have seen a lot of Kahles in civilian hands. I would think that a 4.5-18x, 50 would be a fair size unit.