I have the original TM 9-2190-Dept. of the army Tech. Manual.-Operation, Organizational, Maintenance, Ordnance Field Maintenance-Cal. 50 Basic Aircraft Machinegun An-M3. I can't tell you how much this helped me when I was building my .50. I tried searching the TM archives and was unable to come up with this one. Anyway, I found one copy at Knob Creek and paid dearly for it. I was wondering if anybody would be willing to reprint or copy this as others might benefit from the info.