clearance between barrel and forearm

clearance between the cars

forearm

forearm cartridge block

forearm of stock

forearm stud

forearm with gas tube assembly

barrel assembly (barrel group)

automatic heavy barrel rifle / heavy barrel automatic rifle

blade flapping (the vertical movement in its plane of rotation because of differences in lift between the advancing and retreating blades)

List of Operational Contact Points between Vulcanological Agencies, Meteorological Watch Offices and Air Control Center

correlation between the object linear dimensions and wavelength

AUKUS (ˈɔːkəs) (security partnership between Australia, UK and US)

mean time between critical failure (MTBCF)

mean time between failures (MTBF) (logistics)

mean time between failures requiring overhaul

mean time between significant failures

width between eyepieces

difference between the elevation angular limits

distance between track centers

mean time between repairs (flying hours)

mean time between repairs in temperate climate

mean time between repairs in tropical climate

between bounds acceleration

short circuit between the earphones

mean time between data losses

Hue difference between each LEDs

migrate settings between different firmwares

fuselage and landing gear clearance zone

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

breech and barrel assy

air traffic clearance

clearance decontamination