What does bryan mean when he says there is “no gatling gun attachment” to preaching the bible ?

He meant preaching of gospel did not have any relationship with imposition  of  religion via violence, speccially speaking to the use of guns.

Explanation:

William Jennings Bryan  was against to the spread of ideologies by imposition, by submission of other cultures. He was against impreliasim and rejected the idea of using any kind of violence to preach the gospel. The Gatling gun was a very known weapon on his time and this why he used the phrase "no Gatling gun attachment" as reference to his vision of preacing  without guns, swords nor any violent means.

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