Sightmark core tx scope - SightMark Core TX 2.5-10x32DCR Rifle Scope

I have always had great success with Sightmark products in the past and that is why I was excited to try their new Core TX 2.5-10x32 scope. I mounted the scope on. SCAR Heavy, firing 149gr rounds. It sighted in perfectly at 50 meters. However, once I moved back to 200 meters the issues began. For some reason the elevation would not adjust. No matter how many clicks I turned, I could not adjust the elevation. In addition, the pin holding the front flip up cover vibrated out causing the cover to fall off. Minor issue, but since I could not locate the pin I consider it an issue. Sightmark advertises this scope for both 223 and 308, but I would stick to just mounting it on a 223. I rated this three stars only because I have always been pleased with Sightmark products and maybe this scope was just a defective one. All other Sightmark products I've used were always five stars.