Just had the Troy Battlerail installed on my M1A Scout and mounted the Nikon M-308. When attempting to zero the sight, the elevation turret bottomed out and I'm still hitting 20+ inches above the target. I'm using the mounting rings that came with the M-308. I have an Eotech 552 that had no problems zeroing at 100 yards on the Battlerail but no luck with the Nikon (even had the Range Master from our local Sheriffs Office take me to their range with no success). Any suggestions??? Thanks - been really amazed with the knowledge and advise I've found since joining this forum!