The A-91 is a russian bullpup rifle developed duing the 90s. It was designed as a grenade launcher platform that primarily functioned as a rifle. (The grenade launcher is not attached in this model)
The rifle does not have a conventional ejection system. Rounds are fed through a small tube located direcly underneath the carry handle, and ejected forwards, safely away from the shooter.
It is rarely used in the modern era, possibly due to costs.