Redlines in the 80s started with RJ, R* etc and in the 90's they were AC*. I know for sure because I rode a 92 RL 240B I ordered from Albe's as my campus bike. LaserLites did not have a chain stay brace after the BB. That looks like one peeping out behind the last horizontal tooth. You need to post better pics of the gussett, the bb and the rear and fork drop outs. The fork drop out screams 80's but its definitely a 90s DB Viper. That fork is way unique. Thats the only thing throwing me off from a Viper.