What is M193F?

[KinJames]

Quick question, but what is the "F" stand for in M193F ammo and whats the difference from just M193. Thanks.

[Para45]

Just another one of Federal's naming conventions--I know M193AF is on stripper clips sold 900rds per case but the M193F is packaged in the standard 20rd brown boxes. There's also M193CBP/C/B/PD etc. I've seen over the years and it's pretty much all the same - just pull-down type stuff that FC sells commercially instead of sending out to the troops. It's good stuff.