Oh ###### me, what a piece of a goddamn F(&^*** monster...
[sorry, couldn't help myself]
I love it!
Only adding it to a M4 with a red dot and putting in 6 grenades, you'll be carrying about 10 kilos... and that's only the gun.
Ain't worth it. Unless you're playing like Counter-Strike. "Run, shoot, respawn, run, shoot, respawn, run, shoot..."
Take it to a MilSim, and you'll kill yourself.