In order to meet various demands, NAA's 0. 17 inch revolvers include Mach2 pocket revolvers, HMR pocket revolvers, Blackwell Road revolvers and master pocket revolvers. There is no obvious difference between these new 0. 17 inch revolvers and 0.22 inch pocket revolvers. NAA introduced a 0. 17 inch revolver, and at the same time, it also introduced a change wheel, as long as the wheel is changed.
In order to fire two different 0. 17 inch bullets on these new guns.