Talk:SAS: Zombie Assault 4 Skills/@comment-49.145.21.45-20150711061929/@comment-172.243.0.19-20150923151041

Keep Deadly Force on a Crit Build: at 25 Crit Shot, that extra 25% to weapon Damage translates (roughly) into a 75% boost for each Critical.

1 Point in Killing Spree provides a significant enough boost; after that it starts to drop off. The same goes for Adrenaline. HOWEVER, Killing Spree depends on circumstantial factors which may not always be present; Adrenaline, on the other hand, is pretty much always available excepting the Cooldown time. So max Adrenaline.