I am looking at this gun locally. Little concerned because the barrel measures 23 1/2 inches from the muzzle to the receiver and I read that it is 24 inches from the factory. Is 24 inches from the muzzle to the threads or receiver ?
I'll appreciate any help as I am meeting the seller tomorrow.
Thank you.

Philippians 4:13
"I can do all things through Christ which strengtheneth me."