Pros:

-Firing sounds are top-shelf
-Nifty reload & firing animations
-Magazine is neat

Cons:

-Model physics
-Walking animations could be smoothed out a bit

Conclusion:

I love this gun, especially after watching The Purge: Anarchy. The only catch is, the model clips into the ground, and doesn't lie flat. Still a nice addition to L4D2, keep it up. 

(Is there an M60 somewhere, 'cause I haven't played BF3 yet :P)

Pros:

-It's a hand grenade, jeez.
-Model & textures are passable by everyone's standards.

Cons:

-Walking and looking up and down will mysteriously float the grenade out of the fps hands. Dunno why.

Conclusion:

-I thought it was fixed, but alas! It's not. It's good and all, but the way the v_model reacts when I move is just annoying and unrealistic.