Some hopefully-helpful hints to get you on your way: Another point: Traditional disarming & retention methods used for knives, swords, and polearms work just fine today with handguns, rifles/carbines, & shotguns. The only difference is that instead of thinking about edges & points you have to think about things like muzzle blast, alignment of the bore, and collateral damage to "background" targets. These things will create some natural modifications of what you do, but not fundamental change. And another: The Daikomyosai video from 3 or 4 years back focused heavily on armored combat. Find that one, study it, extrapolate the principles. . .Then put on the kevlar, helmet, boots, and load carrying equipment (and modern weapons) and play. You'll find that the more things change, the more they remain the same.