Splattergun

With splitting fingernails he scratched up various soils from his long-abandoned bridal bed, plus shirt-pocketsful of hardness-eight gravel to serve as splattergun projectiles.

Bess had been a sort of a gift to replace my trusty splattergun, Bessie, lost in the far north.

Where he didn't have to keep looking at the door and seeing the old guy coming in with the shotgun, Jesus, seeing him just like he was there, that face with its downdrawn lines and a splattergun short enough to hide under his cheap sport coat, cut back beyond the choke so that the pattern spread a yard for every foot, clear the whole restaurant like a firehose.

...techniques were somewhat clumsy, and involved firing DNA-coated gold or tungsten particles arbitrarily into cultured plant cells, this 'splattergun' effect has been largely superseded by the more precise 'Agrobacterium' technique.