the hk416 uses ironmans mag and rails
it has an adjustable stock that works and looks like a m4 carbines
the range is about 50ft
there are also some pics of a good bipod you can make
IT WILL NOT BE POSTED !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
you could make it from my m110

































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oh btw, the barrel is slightly too short compared to the real thing, but anyway 5*
he made his m4 carbine from m110 and i made my hk416 from my m110
they buried it in sand and took it out and fired it they also stuck it into water and nothing happened!!! scientifically it 30 times more durable than an m4!!!