That would be a good idea. But the thing about c4 is, it doesn't produce heat flame, but a lager concussive blast. There is some flame but not enough to melt much of anything. C4 also doesn't explode of light it on fire in small amounts, it just burns a lot an puts off heat. Also on your references to the aa12. The aa12 is a fully automatic shotgun, that can use a variety of different types of 12 gauge shotgun ammunition , one of these is a small grenade type slug, but the small explosion is not powerful enough to blast a person to bits, while it can blow of limbs and leave a large hole in a person, it is used mostly for breaching heavily reinforced doors and delivering smaller explosive charges through walls into rooms or buildings filled with known hostiles. I do believe that the highest capacity magazine for an aa12 holds about 24 shells. So it would not be able able to decimate a ki like it says, but it would still be highly effective against one, but the would be best used against subordinates in the event that the operator has time to switch magazines to the grenade shells and take aim, probably in a defensive situation or while taking an overwatch position. Another good type of ammunition to use would be the special designed stun slugs. I can't remember the name of them, but I can tell you some about them. For one they don't have the best range on them but they still can be used to take down a hostile non lethally from a distance. They look almost like small fat and short torpedoes that have two small darts sticking out the front. Each shotgun shell holds one of these slugs. When the slug exits the barrel of the gun little fins unfold from it and help stabilize it for a flatter more accurate trajectory(the same happens for the grenade ones to). When the slug hits the assailant, the two barbs stick into the flesh and get stuck, the main body of the slug falls away connected to the barbs by wires, the slug delivers an electrical charge to the barbs through said wires effectively subduing the target. I'm not if they would work on subordinates as intended because they are dead, but if anything the electrical sugrs could still send their bodies into spasms and convulsions. I'm not sure I all of this is of use to you but I'm sure that some will be. If you you need to anything about different firearms or equipment wether it be about the specs of it or the effectiveness or even it's uses, just ask me and I will see what information I can give you.
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