Stick to weapons with SIB. the choices you have for sib period rifle are
cb5 (blp)
opalo (laser)
handgun
m2100 (laser)
emiks30 (blp)
SIB will do considerably less damage than gdc to begin with but you will save in the long run. and hit 90-95% of the time.
if you search these forums you will find threads that go into this in detail.
gl
