The B01-BIRDIE is a booster part that appeared in Armored Core: Nexus and later in both Armored Core: Nine Breaker and Armored Core: Last Raven
Booster design with low energy drain and respectable power.
This part can be purchased from the shop for 55,000c.
A majority of Ravens from Nexus use this booster, particularly those without OP-INTENSIFY.
This booster part appears almost identical to the MBT-OX/E9 booster part from Armored Core 3 and Silent Line: Armored Core.