depends on what RIS your are looking for... but usually, when you buy a RIS, all the parts needed for install are included, i.e. delta ring for a DD Omega, ring for a Noveske or DD MK18. Other RIS are designed to replace the M4 standard handguard directly... just having to swap them...
Don't know if it was the meaning of you question exactly though...
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Last edited by bigbuzz666; January 23rd, 2012 at 02:59..
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