Here's a bunker I built a few days ago, it has a dual layer design with sloped outer layer to allow grenades (if they aren't exploding to roll down). The outer layer has a medium sized opening which is large enough to shoot through from mid-close range but very hard to throw a grenade inside unless really close.

The second layer has an even smaller gap to shoot through making it extremely difficult for the machine gun to actually get a bullet through (the pistol can sometimes get lucky).

These images show a half finished bunker fairly sloppily made but you get the idea. If a well place grenade goes off on the outside you may sustain 10 points of damage. If a very well placed grenade gets inside the first layer, you just step back allow it to explode and continue raping.

Bounce a grenade off the bottom plates and it'll roll right in the middle gap. Death trap for sure.

Good point
Please try again :arrow:

make it so that u are boxed in and no one can come in and go out of it!

This bunker is actually quite awsome, I know I've played against it. In a one - on - one situation it is near impossible to kill the person inside and throwing grenades at it does nothing.
I tried to through at least 20+ grenades in there and not one got in. :shock:

Awsome fort dude!

Anyone in any kind of bunker is going to be tough to kill 1 on 1 if you're out in the open. He has protection, you don't, and you're the only one he has to worry about. I'm pretty much totally positive you could bounce nades in there if you tried.

w00t thats ok not invincible though

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The top shielding is more forward than the bottom so it doesn't roll in.

Look at your second picture. You can definitely roll nades right in, and unless you have perfect fort building skills (which, you don't), the gaps in your fort will allow the nade to easily kill you.

I don't know how having the top plates more "forward" than the bottom would be able to stop nades at all..

You just have to throw a nade in the bottom part and because of the speed the nade will roll up, enter your bunker and explode...