The brass never ejects straight back. What is happening is as the brass is ejected it clips the optic and bounces back toward the breech. Ive seen both Glocks and sig p320s do this. It seems like its an issue with most polymer guns. With previous optics, RTS2, DPP, Romeo1, etc, the brass just bounces off the optic and usually goes forward instead of off to the side. With the SRO there is enough space beneath the optic window that the brass can get trapped and cause a malfunction.