Pros:

-Great job on modelling and shading, it looks way better than CS:S in-game version. (6.0)
-Replaces the most hated weapon in L4D 2 (along with pump Shotgun) (3.0)
-Somehow it reminds me of the style from Project I.G.I. MP5 (0.5)
-Furthermore the animation is well done (0.5)

Cons:

-I can't say anything bad about this weapon, I always loved the MP5, silenced, not silenced, with scopes. I mean, this weapon is great and Arby26 knows how to make his job right. (0.0)

Conclusion:

What else can I say, not only my review, but as well the others can proove that we are right about one thing, Arby is one of the most needed and experienced in modelling and texturing. I wish you the best of luck in your next works.