delta ring help

[JOE90]

Hi im looking for a delta ring and handguard ring that will fit an ris, as my original m4 delta and handguard ring wont fit properly, strange? not sure if this is normal, it just wont sit all the ris inside it properly thus not allowing it to fit. would you normally require a new delta and handguard ring?

My gun is a jg ma4a1 and pics of the ris will be up on my profile soon, it came of off a CA diemaco? m15a4 conversion. HELP PLEASE its driving me mad