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Differences on 550-550B

What are the differences between the 550 and 550B. I'm looking into getting one but need to know which one suits me more. Thanks

The B upgrades are the low primer alarm and the failsafe mechanical return linkage on the powder measure. No other significant differences.

Awesome, thanks for the reply. I got lucky on a 550 and it includes both of those features. Got a great deal on it but im thinking about sending it in to have it looked at for a refurb once I get my SDB back. Is the pricing the same for the 550 to be sent in?

Yes, $67.95 for service on the 550B as well.

How do I upgrade my 550 to a 550b. I bought belted magnum powder kits and calibre conversion kit but am missing the bar to engage the powder realease into the cartridge and the primer tube loader.

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