I found a deal on Referebed Burrius scopes so I ordered 2. A 1 x 4x and a 3 x 9X, both handgun scopes. I mounted the 3 x 9 on a .357 max. Bullberry barrel on an Encore frame. I set it on 9x and zeroed it, was not at all happy with my groups, 3 to 4 ins. at 80 yrds. Since it was acouple days befor deer season I fugired I would have to live with it, but I thought that the barrel should do alot better than that. I set the scope on 3X to check it and fired a group well under 1 in., the big problem was that it was over 6 in. form the group fired on 9X. I hhunted with the scope that deer season and sold it to a guy that was willing to send it back to Burrius. I never mounted the 1 x 4X scope and probibly never will. I replaced the first Burrius with a Leupold, I`ve had one of them since the 1960`s and now have over 20 of them and have never had the first problem with any of them. I`m back to all Leupolds.
As for the adj. obj. that lets you set the distance at which your scopes parallex is set for.