so the nail gun was when piccolo and nail fused on namek and later when the duo were looking for dr gero they were being absorbed by dr gero. before that they did weapon names here they are: wind scar, spirit gun,bankai,rasengan,gum gum pistol,and nail gun.

Piccolo attempted to use Nail gun against first form cell after light grenade failed to stop him however he was defeated before he could use it.

A speculation about how the nail gun attack would work is that multiple small but powerful ki blasts would be shot out piercing the enemy and explode shortly after in a similar fashion to the needler from halo.

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