Okla. Stat. tit. 21, § 1289.5
DEFINITIONS FOR FIREARMS ACT
"Shotguns" as used in the Oklahoma Firearms Act of 1971, shall mean any firearm capable of discharging a series of projectiles of any material which may reasonably be expected to be able to cause lethal injury, with a barrel or barrels more than eighteen (18) inches in length, and using a combustible propellant charge, but not to include any weapon so designed with a barrel less than eighteen (18) inches in length unless the overall length of the firearm is twenty-six (26) inches or more. In addition, any "shotgun" capable of firing single projectiles but primarily designed to fire multiple projectiles such as "shot" will be regarded as a "shotgun".
Laws 1971, HB 1248, c. 159, § 5, emerg. eff. May 24, 1971; Amended by Laws 1995, SB 3, c. 272, § 43, eff. September 1, 1995; Amended by Laws 2019, SB 24, c. 63, § 2, eff. November 1, 2019 (superseded document available).