"A friend mentioned this thread and wondered why no one had suggested the Ivey RT-150 ring and base set (Scope Rings). It provides 150 MOA - that's IN ADDITION TO whatever is in the scope. While their website lists 30, 34, and 35mm versions, he advised they built him one for his Valdada Terminator (40mm tube) and had made a small batch of them at that time (less than 3 months ago). [He also has March 8-80 tactical.] Some reason the Ivey was not mentioned?"