Mega power fist (Fallout 2)

 is a Unarmed weapon in Fallout 2.

A "Big Frigger" Power Fist from BeatCo. Considered by many to be the ultimate weapon to use in unarmed combat. This one has upgraded power servos for increased strength. Powered by small energy cells.

Location
The earliest time in the game one can obtain this is by obtaining a normal Power Fist in Broken Hills, by beating Francis in a wrestling match, then by upgrading it in New Reno Arms.