Unity states the MARK Kit will work with most 3M Peltor Headsets right of the package. Unfortunately, they do not provide fitment for each specific 3M Peltor model.
Yes, but it may require the user to put a slight bend in the wires at the end to provide tension to the clips.
Sordin/MSA style headsets, use the SARA Adapters (sold separately).
https://www.opticsplanet.com/unity-tactical-sordin-arc-rail-adapter-kit.html
The Revision Batlskil Viper is equipped with Interlocking Long Rails, which appear similar to the Ops-Core ARC Rail. The best chance at fitment would be the ARC Rail version. However, Unity is very clear about their ARC backers being designed to fit Genuine Ops-Core ARC Rail geometry and may create too loose or tight fit-up. As a result, Unity cannot guarantee proper function in non-Ops-Core rails.
No, these will not work with the Walker Razor Slim.
Yes, you would need one of the MTEK models.
Yes, you would need one of the MTEK versions.
No, these will not work with the Walker Razor Slim.
Yes, these should fit the Liberator II.