yes it is compatible with Gen 5 as well.
I would recommend looking over The DPM General Instructions and Forces Data for more information. It can be found linked below:
https://www.dpmsystems.com/wp-content/uploads/2021/04/New-General-Instructions.pdf
Yes, the DPM Telescopic Recoil System for Glock MPN: TRS-GL/6 will work with a Glock 30S.
No. This DPM Telescopic Recoil System will only fit the Glock 29, 30, 30SF, and 36 generation 1-5. The correct recoil system from DPM for the Glock 28 can be found using the following link:
https://www.opticsplanet.com/dpm-recoil-reduction-system-slide-extended-for-glock-all-gen.html
The weight is 7.76oz. Unfortunately the manufacturer does say if the rod is stainless steel, or how frequently the spring needs to be changed. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://www.dpmsystems.com/contact-us/