筒

(warning) flare (esp. used on roads and railways)

grenade launcher

Mahjong

dot tiles; circle tiles

pump

western-style envelope

chimney; stack; flue

lens-barrel; lens tube (e.g. of a telescope)

Counter; Mahjong

counter for dot tiles

round slices

brush case

well curb of a round well

single barrel; single-barrelled

Oriental cuckoo (Cuculus saturatus)

tail covert (of a bird)

tail pipe (of a turbine)

receiver (of a rifle)

multiple barrels; multi-barrel

Hanafuda

second player (out of three); player that goes after the dealer

the sound of gunfire

(chlorine) feeder tube

(ammunition) cartridge

Japanese-style oblong, open end envelope

tube for shaking and dispensing lottery sticks

barrel of a gun

eel trap

multiple barrel model; multi-barrel model

extractor (rifle)