This forum title guarantees nobody interested in the topic at hand will see or reply to it. If you want to change how we handle battle rifle vs assault rifle make a topic that actually says what it's about in the title.
Found this thread by searching recoilless_rifle since I found it aliased when I was going to tag post #7794106 with it due to the backblast from behind the guns on the tracked mecha. Possibly an edge case in the context of Danbooru posts, but large non-shoulder-fired recoilless rifles often start to look more and more like conventional artillery guns the bigger they get, instead of like rocket launchers.