My PD will be ordering two 416's the first of the year. One major question is 10.5" or 14.5" barrel. I am trying to push for the 10.5", but how accurate is it. I know this has ALOT to do with who is behind the trigger. Between the two barrel lenghts, is there going to be any huge difference at around 200-250 yards? We are also looking at the Eotech 512, which I can not see helping out any at 250 yards.