TM 5-4220-225-145-8.Lower Breech Ring (Cont)NOTEThe following procedure is for lower breech rings with neck dam installed only.(4)Replace (neckdam).(figure 5-4).(a)Remove 20 screws (1), three jocking harness brackets (2), lower breech ring retainer (3), and neck dam(4).(b)Install new neck dam (4) and secure with lower breech ring retainer (3), three jocking harness brackets (2),and 20 screws (1). Torque screws to 18-20 in.-20 (2.1-2.3 Nm).5-10
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