i have a 31" 6.5 creed 1.25 straight
i expect that barrel to go 8k rounds
but i can set it back in 3-5" increments 3 times
and don't pay for setbacks
if i could set the barrel back (enough shank to do 1-2+ inches) and not pay for it, then yeah it makes sense
if you're paying to set it back...