An adapter assembly for connecting a surgical reload to an electromechanical handle assembly, includes a trocar assembly release mechanism configured to releasably secure the trocar assembly within an outer tube. The release mechanism includes a release button supported in the outer tube and movable between an extended condition and a depressed condition； a spring clip slidably supported in the outer tube and connected to the release button； and a pair of lock cam pins supported within the outer tube, wherein each lock cam pin is secured to a respective leg of the spring clip, and wherein each lock cam pin is selectively receivable within a respective opening of the pair of openings formed in the trocar housing. The spring clip includes a backspan connected to the release button； and a pair of legs extending from the backspan.
