I did a search for this ammo to find out what the letters stand for and nothing came up.  Price on the AE 193C (5.56 on box) was $200 for 500 rds and the AE 193CPE (black box) 400 rds for $160.  Wondering if you guys think this is a good deal on either one?

Also, can you guys point me towards the a list of what the letters indicate?  I'm wanting to buy in bulk, like $3k worth...any place lower their price for that or is that really not buying a lot at one time?

You can do better than .40c/round... check AIM for example: http://www.aimsurplus.com/acatalog/223.html