Rancilio MD-50 Lower Burr Carrier This lower burr carrier fits the Rancilio MD-50 grinder only. This is a special order item shipped directly from the manufacturer separately from the rest of your order: in-stock units ship fast, while out-of-stock units typically require 1-2 weeks for processing before shipping. COMPATIBILITY: Fits: Rancilio MD-50 grinder only Replaces: OEM MD-50 lower burr carrier (MR_33) Works with: Grinder burr set INSTALLATION: Moderate difficulty, requires grinder disassembly; basic hand tools.