The TERA Rifles (挺進落下傘小銃/挺身落下傘小銃 "Teishin Rakkasan Shyoujyu") were special Japanese takedown rifles developed for paratroopers of the Imperial Japanese Army. All designs were capable of either being broken down or folded into two parts and easily assembled or disassembled. There was one production model and two prototypes:
The Type 2 variant gained notoriety when in 1974 it was used as a sniper rifle by the Scorpio killer in the Clint Eastwood film Dirty Harry .
References
TERA rifle Wikipedia(Text) CC BY-SA