The verse about the razor and the Gatling gun in the Poole lyrics is found in this verse from Thomas W. Talley, Negro Folk Rhymes (175, Looking For A Fight):

I went down town de yudder night,
A-raisin' san' an a-wantin' a fight.
Had a forty dollar razzer, an' a gatlin' gun,
For to shoot dem Niggers down one by one.

Published originally in 1949, Talley's manuscript mostly dates from 1921.