Welcome to the board Icelander, I have never heard of a ATN scope.My opinion is buy good glass for your rifle.The bargain brands end up costing more in the end.Leupold,Zeiss,Swarovski and Nikon make excellent quality optics. Be prepared to pay for this quality.There are so many brands to choose from. I would stay away from Tasco for several reasons. Quality and supposedly out or going out of business. I've heard several negitive reports about the Simmon's line.I don't know about the quality of the new Redfield's. Since the original Redfield went out of business back in 1997 there's been allot of changes.The old ones were excellent scopes.They are now made in Japan and no telling who's making them for Redfield. I think I would stick with a Leupold Vari XIII or one from Leupold's line.Leupold has scopes in different price ranges and have a Lifetime warranty. Ask around and compare the different makes and models. Then you can decide what fits your needs and (or) budget. Ruger Redhawk

Support the NRA...Protecting our Gun Rights and Freedoms is everybody's responsibility. Ruger Redhawk A proud NRA Life Member since 1977.