Issue with "PDW" as a weapon category

[Evil Tim]

Just to explain further, this is the heading text to Category:UBGL:

If you are creating a page for a UBGL (Under Barrel Grenade Launcher) make sure to add [[Category:Gun]],[[Category:Grenade Launcher]] and [[Category:UBGL]] to the the page so that it is listed in this category.

Now, the way I see it, we shouldn't add Category:Grenade Launcher to these; rather, they should only be on Category:UGBL, which is a sub-page of Category:Grenade Launcher. That way we have one list for underbarrel launchers which is a sub-category of the main one, and a main list of everything that isn't in the sub-category.

The current setup would be like if Category:Cat was a sub-list of Category:Feline, but there was no list of only felines that weren't cats. Fine if you want to find a housecat, not so useful if you're left sifting through housecats trying to find a type of lion.