Downward ejection
In firearms, downward ejecting refers to firearms which eject spent cases downward from the firearm's receiver, rather than the more conventional designs which eject the brass to the side. This feature simplifies use by left-handers, and can help prevent gases and debris from being ejected near the shooter's face.
Examples
LMG
BrEn gun
Browning Semi Automatic 22
Springfield Light Rifle
Smith & Wesson Model 1940 Light Rifle
Ithaca M37 shotgun
FN P90 submachine gun
Kel-Tec RDB
References