TM 9-2350-256-10 Table 2-1.  PMCS-Continued. Location Crewmember Not Fully Item Item to Mission No. Interval Check/ Procedure Capable if: Service 27 After Machine Check gun mount for Damaged, Cont. Gun Mount missing pins.  Check for binding, or tightness of all fasteners missing parts or and operating parts. pin. Operate ammo box locking latch.  When locked, ammo box must be sturdy and secure. 28 After Caliber .50 Commander Machine Gun WARNING Ensure machine gun is clear of ammo and barrel is free of obstructions. a. Disassemble, clean, a. Any damaged and lightly lube per TM parts found. 9-1005-213-10. Fault listed in "Not Fully Mission Cap- able  If" column of machine gun TM. CAUTION Never pull back bolt assembly with the safety on "S": the safety assembly will be damaged. b. Reassemble and check b. Weapon does for ease of operation. not function properly. 29 After Snatch Crewmember Block Assemblies a. Visually inspect two 90- a. Any snatch ton (81.7-metric-ton) block (1), one 25-ton (22.7- assembly metric-ton) (2), and missing. one 10-ton (9.1- metric-ton) (3) blocks for presence. 2-66