Unknown Rifle

[Bushwhacker]

Several years ago while at a gun show I saw a rifle that was a .22lr it had box type magazine that sat on top of the reciever and held 100 rounds, also was semi-auto.
Can anyone tell me anything as to brand,are they still available,etc.
Thanks.

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Justice for one,Justice for all.

 

[4V50 Gary]

If that box type magazine was octagon in shape, it's probably a Calico.