I have been trying to research details on the Gardner gun and I was wondering if you could help. Do you know the details on the differences between the different models of the Gardner in regards to weight and efficiency? I am wondering which would be best as a mobile machine gun. Or if the design could be plausibly modified further to that purpose from the OTL design.
A resource I found mentions a model that I think would fit that criteria but I cannot find any further references to the model mentioned. It states "Gardner Gun Company’s two-barreled gun production was again slow and by March 2, 1886 . . . Colonel Arbustnot, British Army, indicated to Norton, if the two-barreled gun weight could be reduced to 80 pounds, the gun would be adopted. He consented to have the barrels and casing shortened. Colonel Arbustnot directed that thirty-six, two-barreled guns and twenty, five-barreled guns be changed to the new Enfield Martini ammunition in Caliber .40"
80 lbs would be a good weight for a mobile machine gun unit. I think the comment of it being in Enfield Martini .40 Caliber is a typo though because the resource I know of state that the Martini Henry was .45 Caliber and the Enfield Martini was .303 caliber