head-space adjusting screw locking plug

head-space adjusting screw

front-sight locking screw

counter-recoil spring adjusting plug

water jacket plug / water-jacket plug

dash pot adjusting screw

valve-adjusting screw

engine idling speed adjusting screw

adjusting screw

adjusting head

head screw gasket

cross head cap screw

socket head cap screw

adjustable head space feature

head space

head-space gauge

tight head space adjustment

head-space adjustment

excessive head space

penetrating head injury / open head injury

drop head body (drop-head body)

head-to-head flyoff

infrared homing head (IR homing head)

locking block

locking cap

locking knob

locking lug

locking nut

axle-tree retaining bolt locking pin

automatic locking retractor

barrel locking spring

barrel-locking thread

wire locking ring