South Africa Law regarding silencer/suppressors

[NPvanderMerwe]

Good day

I am from South Africa. We do not have very strict laws like in the US regarding the use and manufacture of silencer/suppressors. I would like to know what would you guys advise regarding silencers/suppressors on the following firearms:

Galil/AK piston stroke
AR DI

More specific what material the outer and the inner mechanics of such a can is made of, and maybe some help in general please.

Thank you