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They are infact different. When I put a C8 body on my 733 i also changed out the barrel for a guarder m4 barrel and found that my 733 grips no longer fit. I had to pick up a pair of m4 length grips and a new grip cap on the front sight to attach them properly. unless your really good at modding i'd suggest finding an m4 length barrel for the ris or go the more expensive route and try and find an ris to fit a 733 barrel.
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