Ok so we all know that scouts, with the exception of Telion, don't get scoped or silenced bolters. So here's what I added in my fluff for a new chapter,
Scoped Bolt Gun- (points to be decided upon)
Can fire one shot at 30 inches, but can only rapid-fire at 12.
So the point is the scope adds 6" to the maximum range. I made this upgrade available only to an elite version of scouts, so this wargear upgrade could only work on scout units.