Different sources (authentic) have different views. Just google C90 rocket system and you will see what i am saying. Most of the links you will see mention C90 as a single use system janab.
You know the reason???
C 90 is a decades old system, originally came as a single shot disposable system. The targeting mechanism would be kept while the launch tube will be discarded after the shot is fired. The tube came fitted with the munition and could not be reloaded.
From the same site of this company:
http://instalaza.com/producto/c90-cr-m3/?lang=en
http://instalaza.com/producto/c90-cs/?lang=en
(but i guess you have already seen these products
)
Now the company have worked and have developed/are developing a new reusable tube version, called C90 Reusable, this is the ONLY variant of family of other wise disposable rocket launcher systems.
Khair, Pakistan is going for ALCOTAN anyway so C-90 is not related to us. ALCOTAN, currently, comes as a single shot system. Only in future we may see some work done to make that tube reusable.