M15A4 RIS?
 

Hey guys, I need some inputs here. This is for people who owned both M15A4 or M15A4 RIS.
I have a CA M15A4 (M4A1).
I want to add a KAC RIS on it. So the question is, can I just buy the RIS? without the end cap? Does the regular CA handguard and the CA RIS both share the same end cap retainer?
I know on the Marui, the regular handguard and Marui RIS both use different end caps, but I do not know if that's the case with CA M15A4 series. Thanks guys.