i need help scaling down my drawing?

falleninahole

New member
i am drawing a tavor 21 assault rifle which im going to be putting my own spin on, but i need to know where to place the new magazine well without changing to look to much, i need to know where the barrel ends in the rifle to scale

actual rifle length: 28.3in
actual barrel length: 18.1in

drawing:
rifle length (on paper): 8.2in
barrel length: ?????

HELP!!!
 
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