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Diff between 550 & 550b

Can somebody tell me the difference?

I have friend who has a 550 he wants to sell me but I had my eye on the 550B or the 650. I also do not mind saving money too and his is much less.

 The only differences are the presence of the low primer alarm and the mechanical return linkage on the powder measure. There are not any markings on the frame or link arm to distinguish the RL550 from the 550B.

 These items are available and easy to add to an older RL550 by the user. It is not necessary to send a machine in to add these upgrades.

dillon,

Thanks for the information, either way I go I hope to soon be a happy member of the Dillon reloading community!

was the primer track bearing originally a part of the 550? my older 550 doesn't have one is it missing or it a diff between the 550 and 550B

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