Pros:

-Was cool and fun to experiment with until a little bit after

Cons:

-Sounds like a pellet gun
-Gets annoying after a while
-Couldn't fit any pistol that I could imagine (even the five-seven itself)

Conclusion:

Needs a bit more work to sound a little bit more than a pellet gun but not too harsh like a magnum, like in between. That's the only problem I have with pistol sound mods like this. It's either too powerful or too dull. Maybe even a custom reload sound would make it cool.