Pros:

A nicely detailed M4A1 Rifle

Cons:

Pretty much the same as the M16

Conclusion:

If you want a slight change from the M16, this will do the job

Pros:

Great Detail
Looks Just Like real Crysis version
First-Person works appropriately 

Cons:

Slight clipping when using a melee weapon (not that bad)

Conclusion:

A great skin mod, must download for Crysis fans