If I were to do NERFs. That is, IF I were to do NERFs as in actual springs and barrels, etc. I would be using the formula below. But since I am more interested in their shells, I am not doing NERFs nowadays. But the formula is interesting. Just scroll down on the link page…..
http://britnerf.myfreeforum.org/Barrel_length_about382.html
Pardon my NERF
Posted in Daily Catch.