Kiruka's A Better Barracks Arsenal for LWotC (which you can run with RPGO even without LWotC) adds several weapons that are designed and balanced around costing 2 AP to fire.

RPGO by default changes all sniper rifles to only cost 1 AP to fire, and this affects those weapons from ABBA as well.

I've made a compatibility patch so that those weapons from ABBA keep their 2 AP cost.

These are the affected ABBA weapons:

• LMGs
  
• Auto-Sniper Rifles
  
• Advent Scout Rifles (though they also have Snapshot)
  
• Advent Smartguns