I follow that guy religiously. :)
P.S. Don't be beetch!
The 100 round drum is either a modified Beta C-Mag for the Colt 9mm SMG or H&K MP5 9mm SMG.
This is a specialist's weapon and not practical for average shooters unless you want to make lots of noise. For me, I'd put a front grip on the accessory rail (two hand control) and fit it with a quality suppressor. Now, you're talking practical and fun.