When making a weapon, do you have to leave the magazine detached from the gun itself???

P.S. im tryin to make a sort of remake of the rocket launcher using the old anims.
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Do you know where i can get a hek+ that will not corrupt my .secnario tags when i extract them. cuz i still get that error when i open a hek+ extracted senario that either says "you tried to open a non-senario tag...Bad" or it opens for 2 secconds and then closes.