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I have to say, this is one of the best mods I have ever played out of all the SMODs I have installed.
This adds a sense of actual realism, instead of getting toys to play with in the Half Life 2 campaign. There are also side missions to play, so you can still complete the Half Life 2 campaign and still keep playing!
You can practice your skills using the Shooting Range. You can get there by typing in the console "map Shooting_Range".
There are a number of cheats too. You can type "exec neo" to make yourself the Chosen One, and get duel wield weapons and infinite ammo. I did find it a bit hard to revert it back, but that doesn't really matter.
I would recommend this mod to a friend that has Half Life 2 and Counter Strike Source any day. It's why I give this mod 10/10.