"Manual-String-Release" gun, P501 LAYER.

First barrel. It has 120 holding pins.

Test.

Jam !

The longer pins are cause of the accident.

Cuting the pins.

First design.

Main frame.

Using an electric driver's motor.

Grip.

I decided an entry to 20th HANDS GRANPLIX.
* The HANDS GRANPLIX was a famous contest of hand-works, sponsored by TOKYU HANDS, Japan.