Well, I made a discovery when I was messing around with some shells, I found that if you load a red rod into your rectangle, then put a shell of 5 silver spacers all the way back on the red rod... The red rod then flies extremely straight. The shell then falls straight down, where you can use it again if you want.

P.s. This also works for yellow, and grey rods.
P.p.s. You can also do the same thing for oodammo, but with only one silver spacer.

TRY IT OUT PEOPLE
=P