Okla. Stat. tit. 21, § 21-1289.3: Definitions for Firearms Act and Self-Defense Act —

Pistols or handguns.

DEFINITIONS FOR FIREARMS ACT

"Pistols" or "handguns" as used in the Oklahoma Firearms Act of

1971 and the Oklahoma Self-Defense Act shall mean any firearm

capable of discharging single or multiple projectiles from a single

round of ammunition composed of any material which may reasonably be

expected to be able to cause lethal injury, with a barrel or barrels

less than sixteen (16) inches in length, and using a combustible

propellant charge, but not to include any firearm with an overall

length of twenty-six (26) inches or more, flare guns, underwater

fishing guns or blank pistols.