I recently was having a discussion with a friend about the usefulness of a sub-gun system. I argued that the lighter weight and the milder recoil in general compared to a carbine in 16" in .223 would be superior. He argued in this day and age that a sub-gun was a dead system, and that a carbine in any rifle caliber would far outline the benefits of lighter weight and recoil. What do you guys think? Is the sub-gun a dead system or is there life for it still in different roles?