Are Lego connector pegs allowed in FTC?

[FTC2858]

Are LEGO Pin Connectors like Part 2780 & Part 6558 allowed on FTC robots?

[Westside]

Yes.

Section 7.3 Robot Rules includes rule <RM02> Commercial Off-The-Shelf Parts, in FTC Game Manual Part 1:
https://www.firstinspires.org/sites/...nal-events.pdf

Not that long ago (to some!) the FTC robot controller was the LEGO Mindstorms. The Pitsco FTC Kit included adapters to join Tetrix parts with LEGO Technic Beams -- using the LEGO Pins you are asking about.