If you can find any pictures of the Maruzen FiveSeven field stripped, you'll see the slide is held onto the lower frame by 2 very small rails made of plastic. I'd say they're about 1cm long each. That's all that is holding the slide from popping off the top.
As others have mentioned, it's very plastic'y feeling. No weight at all until you put the mag in, the mag however is quite nice.
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Various BB throwers
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