Moisture effect on fuel, 35_e_ effect on ignition cylinder, 31, 41 effect on thickener, 35_e_ effect on weapon, 41, 51_g_, 71_e_, 77_b_ Mounting board, 12_g_ - N - Needle adjustment, 52_e_, 75_d_ cleaning, 52, 55_d_ description, 75_a_ installation, 75_c_ leaks, 58 removal, 75_b_ Nitrogen charging apparatus, 32, 33, 46, 48_b_ leaks, 56_b_, 61_c_ release of, 66_b_ volume required, 9_g_, 32_c_ Nozzle adjustment, 52_e_, 56_b_, 75_d_ cleaning, 52, 55_d_ description, 75_a_ leaks, 56_b_, 58, 75_e_ - O - Oxygen, hazard from use, 32_c_ - P - Packing chest cubage, 9_d_ dimensions, 9_d_ opening, 12 use of, 12, 30 weight, 9_c_ Paddle, 35, 36 Painting, 13, 41, 68_c_ Pins, (carrier) 71 Plug, coupling, 10_f_, 17, 39_c_, 48_b_, 70 Plug, filling, 37, 39, 49, 51_d_, 56_b_, 69 Plug-retainer assembly, 69 Plug, safety-head, 37, 39, 49, 51_d_, 69 Plug, testing, 56_b_, 67_d_ Point-blank range, 22 Positions, firing, 24 Precautions in training, 15 when charging, 33 when filling with fuel, 37-40 when firing, 22_a_, 24_d_ when preparing fuel, 35, 36, 40 when servicing, 57 with cylinder, 18, 31, 57 with gun, 20