" 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 .
* HANDS GRANPLIX = the famous contest of hand-works , sponsored by TOKYU HANDS , japan .