A combat weapon is one that would be appropriate for use in the deliberate initiation of multiple intense conflicts. Such a weapon would have to have sufficient range and penetrative capacity to neutralize enemy combatants who may be wearing soft armor, will be using certain amounts of artificial or natural material for cover, and who will be using rifle-caliber weapons to do the same to you. That would require the weapon to be of a rifle caliber. A pistol-caliber rifle or carbine could not even be considered, therefor. Additionally, the weapon would have to be of a design that would allow it to reasonably accept a 20-30 round magazine, and it would have to be easy to disassemble for frequent teardown for routine maintenance. That would require the magazine to load either forward of or behind the pistol grip, and the takedown hardware would have to be disengaged without punches and hammers. These factors pretty well eliminate HP carbine as options for actual combat weapons. They are, however, appropriate for utility or self defense roles. In most self defense situations, the engagement ranges would be well within the range of the pistol-caliber cartridges, and the capacity of the magazine's would be quite sufficient for most scenarios.