How not to test your suppressor

[ZX9RCAM]

They do cause more drag.
Maybe the fact that he was shooting straight down could have something to do with it.
Some guns come with different springs for use with a suppressor.

 

[majormadmax]

I don’t know much about suppressors. Why does he keep racking the slide each time? Does a can prevent the gun from cycling properly?

Yep. Subsonic ammo usually won't cycle a semi-auto pistol or rifle, which is why a lot of people only use them in revolvers or bolt action rifles...

 

[ZX9RCAM]

Does he mention using subsonic ammo?