I have had and used a 4x IOR for about 16 years. It is on my primary carrying rifle and Has never given me an Issue. For years I had it on a .458 win. and it never moved even after about 300 full power loads. Mine has a 7a reticle. I do not know about newer models ,but the adjustments are a little tough to get used to but are very precise and rugged. The steel tube adds some weight also. The Glass is usually awesome in them......
