heres my untrained arm still measuring 19''. i never took a picture with a tape measure when it was over twenty inches.
that's a big, big arm dude
and not to be a jerk, coz i like you and you are a good guy
but, that arm isn't stage ready (but yes, it is big and impressive)
big ach had well over 18 inch arms as a fatty, but when he got down to contest level leaness his arm was barely 16 inches