track block pin

track pin retaining pin

cylinder block (engine block)

feed block slide (feed-block-actuating slide)

track skirt (track shield)

track while scan / track-while-scan (TWS)

track retaining pin

track pin driving cam

track-pin retaining cam

head of track pin

arming pin; safety pin

firing pin retaining pin

belt-feed pawl pin / belt feed pawl pin

block diagram

block face

block supplies

locking block

TNT block

breech block pivoted below the level of the chamber

disrupt, fix, turn or block the enemy force

all-round vision block

back on the block

block off

direct vision block

surveillance vision block

trunnion block

vision block

advanced building-block for large-area exploitation

basic building block

basic building block module

building block

building block approach

building block organization concept