TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9--2350--311--10 Change 6 2--183 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.2 Boresighting — Continued d. Checking Boresight of M117/M117A2 Panoramic Telescope Using the M140/M140A1 Alinement Device — Continued