I could see dumping the Large Lasers for 4 medium pulse lasers. Put the extra tonnage straight into the armor.
Maybe dump the medium lasers for additional armor or sinks.
They are exceptionally rare but certainly available per plot.
I had thought you had placed 4 Large Pulse Lasers on the Rifleman. Thus replacing ACs and Large Lasers.
What is the actual configuration on the Rifleman?