`  Furthermore, you cannot dispute that there are 3 main iterations of the m16. What, does the m16a4 not exist now? It doesn't matter how many are in use, the fact is, it's an iteration of the development, that's all the article states.  Finally, marines do NOT get m4's in any large numbers. Any marine will tell you that. Would you like me to go bring some in to post that here?      Aim  Fire! `