Multiple outlet grounding

[Trouyano]

Hello, I was wondering if it's legal to use copper barrel crimps for a multiple outlet..
In other words... Instead of using green wire nuts to tie all the grounds together.

Thank you

 

[kwired]

Hello, I was wondering if it's legal to use copper barrel crimps for a multiple outlet..
In other words... Instead of using green wire nuts to tie all the grounds together.

Thank you

If used within any listing instructions, why not?

Same goes for the wire nut.