What It Is
The 300 Club is an unofficial, voluntary-membership Airsoft "club" with no agenda and no official roster. Membership is self-declared and self-regulated.
What the name means
Nothing to do with the movie/graphic novel about the screaming musclemen.
It refers to two things:
Could I be a Member?
If your guns all have stock springs, and you consider a bag of BBs to be a LOT of ammo that will last you forever.... then yes!
Why be a member?
Membership is a badge, or way to recognize others like you! You can use the following "badge" in your signature if you like, to indicate your membership in the 300 Club! Think of it as a secret handshake, only not actually very secret.
(Feel free to link to these images directly. That way if it ever changes, you know you have the latest one!)
200x25 .jpg file, 2450 bytes (2.39k)
125x16 .jpg file, 1426 bytes (1.42k)
Other Junk
How Not to be Useless when Playing Soldier (PDF Download). It's an intentionally faceless, unattributed internet document so take it or leave it.