Board Thread:General Nerf discussion/@comment-5895032-20130621160722/@comment-10582531-20130629022009

Nerf seems to incorporate some of the modding communities ideas into their new lines. If modders made pistols that fire 3/8" stefans, maybe Nerf would copy it.  3/8" foam backer rod comes in closed-cel and open-cel; the closed-cel stuff should be denser. All the 1/2", and larger, stuff is open-cel.  Barrels would need to have an inside diameter of about .375 to .380".

13/32" thinwall hobby brass tubing is close, but there are other options.