In the next few weeks I'm looking at changing out the rail for a low profile rail and maybe the Holographic sight for an Aim point Comp M4 RDS or maybe an ACOG.
I'm also looking at getting a First Aid Kit Pouch, coz you never know, as well as a utility pouch for anything else I feel like carrying with me.
In the long run I'm thinking of getting a SA VZ58 kitted up as my primary and grabbing a Glock 17 too. The MP5/Glock 19 would then become a backup.
I'm also thinking of whacking a RIS System with a Vertical Grip and Bipod on the MP5, sticking a long Suppressor on and using some stubby mags for a cool marksman like look that can quickly be swapped out for the torch foregrip between games.