Board Thread:General Nerf discussion/@comment-38684270-20200208165548/@comment-30049823-20200208175051

HOLY CRAP, you got #5 in the ultra-rare limited production run of 16!!! =D HA, just kiddin'.

I don't have a Quadrot yet (unless two Doublestrikes count), so I can't compare, but in the injection-molded plastic industry, when they make a mold (carved from a huge steel block) that has multiple copies of the same item, each item is marked with a unique marker (usually just a single digit) so when all the seemingly-homogenous parts come out and some of them start failing quality control regularly, they know which part in the block needs to get fixed up (or if it's unrepairable, blocked-off so it quits wasting plastic)

NORMALLY they make an effort to put these markers somewhere that isn't visible on the outside of the product, like on the interior of the shell or the enclosed end of a priming handle.

But since this looks very intentionally visible, and says "5/16", I'm going to bet $1 that it's just part of the Zombie Strike line's styling. Like, the priming handle was built from a salvaged 5/16ths" box-end wrench or something.

So, there's a few possible explanations, if that's what you were lookin' for...?