photoracer
Competition Shooter
My 6.8 SPC II DMR rifle has a 20" A2 barrel on it with a Vortex Viper 6.5-20x44 scope and USAMU style Tac-Mod stock. The scope bell is exactly even with the back of the receiver above the charging handle. You want to get everything so that if you have to snap the rifle up to your eye everything is in the correct relationship and does not require any extra movement in any direction before you pull the trigger.