This answer is for the Mockingbird Single Stroller 2.0, though one maker didn't say which version.
Key specs
Adapter
about $50
Weight with carrier
37.9 lb
Seat rated to
35 lb, 32 in
Stroller folded
33.5 x 25.5 x 16 in
Good to know before you click it on
Any seat model not named in Mockingbird's chart is not compatible; the chart covers full-size strollers only (not the Travel Stroller).
Mockingbird strollers accept only Mockingbird adapters, not other brands' adapters.
About this pair
The Britax B-Safe Gen2 goes on the Mockingbird Single Stroller 2.0 with the Mockingbird 5-in-1 car seat ring (model PD_SA_1_1), about $50. With the carrier on, you are pushing about 37.9 lb (27 lb stroller, 10.9 lb carrier). The seat itself is rated up to 35 lb and up to 32 in, per Britax.
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24 other infant seats fit the Mockingbird Single Stroller 2.0.
Summary from the makers' published data.
How to set up the Britax B-Safe Gen2 on the Mockingbird Single Stroller 2.0
What you need
The Mockingbird Single Stroller 2.0
The Britax B-Safe Gen2 carrier (its car base stays in the car)
The Mockingbird 5-in-1 car seat ring (model PD_SA_1_1)
Step by step
1Set the brake and take the stroller seat off (press the white buttons on both sides and lift).
2Hold the adapter with the short end with the upright plastic part toward the handlebar.
3For Britax, Evenflo and Baby Jogger seats, press both side buttons and rotate the support bar down.
4Set the adapter into the left and right joints until it clicks.
5Place the car seat facing the handlebar onto the adapter until it clicks.
6Attach the velcro straps to the front of the car seat (called for with Britax and Evenflo, optional extra support with Chicco, Graco and Baby Jogger).