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are 450 Primer bars same as 550?

Is there a difference between 450 primer bars and 550 bars?
Thanks

Yes, the RL550 primer bars are wider, do not fit in the manual primer feed body. The primer cups, seating punches are the same. The manually operated primer bar that was original equipment on the RL450 was steel, the automatic primer slide bar for the RL550 is an alloy casting.

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