As discussed in many threads including this one: http://forums.bistudio.com/showthread.php?184110-Select-all-gear-classnames-per-playerside [^]
Also somewhat related talk-page of the VA system: https://community.bistudio.com/wiki/Talk:Arsenal [^]
Everything in the game is side-based, so it makes sense to also be able to be able to select the weapons per default side.
Not only weapons, also uniforms, magazines and items need to be made select-able per side, so we can easily restrict weapon selection systems to contain items for a specific side.
I'ts not very realistic for a Virtual Arsenal box to have a full selection of the opposing gear (also not allowed per Genevieve convention)