Can i use a vex v4 claw pieces for my custom v5rc robot
By v4 you mean Cortex, right? Yes, you can use the Cortex claw bot claw, my sister team used it, and it has passed inspection.
Note: don’t make your arm too long if you’re doing one, make sure it doesn’t extend about 24”
Kudos to the inspector for following the game manual…but let’s look at a more official answer…
Rule R7 (h) deals with legacy parts, and directs you to this “hard to find” page of legal parts, which lists the old Claw along with a variety of other discontinued parts: https://www.vexrobotics.com/v5-discontinued.html