The newest real steel HK variant and successor to the venerable m16 family is the "HK416" carbine. basically a hybrid between an mp5 and an m4. the link can be found here
A 7.62mm, 178 grain bullet travels at a velocity of 2600 fps and has 2,520 foot-pounds of kinetic energy, which is enough to penetrate through 9 soft-target personnel...
it looks nice, i think it would look even more nice with a full stock on it...
althought i love the gas piston system HK useson their real steel version. way better than the gas tube that COLT, Armilite, and FN uses, but bood luck finding a gas piston upper in airsoft. the closest thing you will find is a HKM4D body with the LR 300 upper. and the grip aswell.
that gun looks tight! not sure about the full stock joe, but i would have to see it with it to put my $.02 in. :wink:
Some say-That it's impossible for him to wear socks, and he can open a beer bottle with his testes.
That gun is kick a$$ thats all i have to say