They are fun to shoot but a waste of ammo

I had one for a short time and let it go on down the road

Closed bolt models are by far the most common, the open bolts were the first design and were too easily modified to full auto

Here is a little nostalgia for ya

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I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
-Thomas Jefferson