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Hi Joel and welcome. While this barrel will fit in the SFX Rival, neither safety nor full function are guaranteed due to differences in the locking mechanism of the barrel as shown here (User claims it still fires no issue): https://www.reddit.com/r/canik/comments/11zkt1v/tp9sfx_barrel_compatibility_with_rival_sfx/#:~:text=There%20is%20no%20specific%20threaded,of%20damaging%20the%20locking%20block