Hi guys. Finally going to get a chance to sight in my new Russian Red saiga ak. I've read several different reports about the process. What do you set the rear sight to? Mine has either a 1, 2 or 3. The guide with the sight tool said 2 at 25 meters but I've read differing info. Assuming I sight it in at 25 meters, do I leave the rear sight set to 2 or move it back to 1 when I'm done? Thanks for all the help!