Stress Relief in 4.0

[Guero]

I'd really like to be able to use the stress relief sub as well as the one I'm currently working with, but it's in 5.0. Was there ever a 4.0 version for free?

[InTheZone]

I'd really like to be able to use the stress relief sub as well as the one I'm currently working with, but it's in 5.0. Was there ever a 4.0 version for free?

The old stress relief sub was 3g but it was free.

[Guero]

Either way. Is there any way to still get it?