the 10/22 can be locked open by pulling the bolt back and then engaging a small lever underneath. its then only possible to close the bolt by pulling bolt further back and pressing the same lever. its a pita to be honest. however it takes only 20 minutes and a file or dremel to modify a 10/22 so that just pulling back on the bolt will release it.
i have never laid hands on a TC, but other 10/22 clones include AMT and webley & scott (filipino made i think)
the 10/22 is great but expect to pay to have a trigger job done on it as from the factory they are heavy and creepy.
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