This is good stuff.
These are good animations.
Graphics fit the Madness theme well, and look really good. The guns all look realistic and so do the blood hits, but the blood splatters could use some work. They were for the most part a bunch of lines drawn on the wall somewhat randomly, and blood splatters are fairly uniform in that they all follow the same trajectory.
Animation-wise, everything was done very well and was very fluid. There is one problem, however, and it is that most guns don't have that much recoil. Bring the recoil amount down, and you're golden.
The music is copyrighted by Avenged Sevenfold, and it's not a good idea to use copyrighted music in your movies. It's also too loud if it was intended to be background music. The sound effects, which are at a reasonable volume, are slightly overpowered by the music.
For a series of test animations, these look really good, and should definitely be put into a full movie.
As a side note, the pixellation effect on the text and on the characters would be better if they were synchronized, such as the title is pixellated when the characters aren't, and vice versa.