5.56 NATO Case Reference Model

This is a reference model of the 5.56 NATO cartridge case. It will likely be of limited use as-is, but is rather intended to be used as a reference for other projects.

The exterior dimensions are based on the drawing posted on Wikimedia at https://commons.wikimedia.org/wiki/File:5.56x45mm_NATO.jpg
{By Francis Flinch (I created this work entirely by myself.) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons}

Interior dimensions are guesstimated based on this drawig found via Google image search:
http://i.imgur.com/gIdQCq6.jpg

I wouldn't advise using this model in any application where the case thickness could have safety consequences.