The Chicco KeyFit 30 attaches straight to the Chicco Corso; there is nothing extra to buy. With the carrier on, you are pushing about 32.9 lb (23.4 lb stroller, 9.5 lb carrier). The seat itself is rated up to 30 lb and up to 30 in, per Chicco.
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2 other infant seats fit the Chicco Corso; Chicco Fit2 and Chicco KeyFit 35 need no adapter at all.
Summary from the makers' published data.
How to set up the Chicco KeyFit 30 on the Chicco Corso
What you need
The Chicco Corso
The Chicco KeyFit 30 carrier (its car base stays in the car)
The Chicco carrier attaches straight to the stroller frame; the manuals below show exactly where.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.
“Compare Full-Size Strollers ... Bravo / Bravo Sport / Bravo LE ClearTex / Bravo Primo ClearTex / Corso LE / Corso Primo ClearTex / Corso Flex ... Car Seat Compatibility: All KeyFit & Fit2”