Is it possible to export a GPG subkey's public component?

I'm trying to export the public component of my subkey, but all GPG will give me is the public component of my master key. The keyring is set up like this.

$ gpg -K
/home/alex/.gnupg/secring.gpg
-------------------------------------------------------
sec#  4096R/4ACA8B96 2014-06-21 [expires: 2015-06-21]
uid                  Alex Jordan <alex@strugee.net>
ssb   4096R/633DBBC0 2014-06-21
ssb   4096R/93A31C56 2014-06-21
$ gpg --armor --export 93A31C56
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v2.0.22 (MingW32)
...
-----END PGP PUBLIC KEY BLOCK-----

The key that is output to the console is the public component of 4ACA8B96, not the requested key. Is there a technical limitation that's preventing this from working, or is it just GPG being stubborn?