Life cycle sustainment support for the M109 FOV is currently provided by multiple government and commercial organizations using many different processes to deliver both services and materials.

• 新设计的炮塔采用改良式装甲及凯夫勒防弹内衬，提高了对乘员的防护力，内储有三十九发备射炮弹，可以三百六十度旋转。