Mobility = Movement Speed = Optimize for it
Encumbrance = Fatigue = Optimize away from it
More Fatigue = Bigger aiming reticle (accuracy decreases*)

*This matters much more for the RPD which can shoot for lethal at level 1 and 2 armor, deals 99 damage to level 3A, and two tapping level 3 and 4.
You may check bullet stats by hovering at the ammo under your equipped weapon.

1. Pick any LMG.
   
   • Or RPD because RPK is obviously LMG master race.
2. Cut weight anywhere possible in your loadout and try to bring it under 40 kg.
   
   • Yes, you may go max encumbrance, but your accuracy will be total garbage throughout.
     
   • With RPD, this often means you will only be carrying an extra 3-4 drums in your vest.
3. Pack 4-6 extra drum mags or 100 round boxes in your backpack.
   
   • 200 round boxes are harder to fit into enemy vests. Do you see where this is going? ;D
     
   • Before finishing, double check to see if your encumbrance is still under 40 kg with your backpack emptied out.
4. Start any mission.
   
5. Fill up the first downed body with all of your extra ammo or items.
   
6. Carry the body with you and realize that you just broke the game.
   
7. Never speak of this again to ensure LMGs retain master race status.
   
8. As a last resort, pack to max capacity then drop your extra gear on the ground after deployment. Not ideal, but still works.

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That is all. Dismissed!