Can you all help me find out what model of bb gun this is?

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I don’t see any scratches near the rear retention pin in these pics (not saying they’re not there). But... it looks like the “rear retention block” or whatever, is missing. There’s even a little gap between the stock and action where I suspect it went. Wonder if that part was metal on the B3s or plastic.

Does the gun still shoot? I’d take the sucker apart and give it a good line job and cleaning. If you want to keep it those stocks can look better with some TLC. Nice fun plinker or springer tonlearn with. 
 
YUP $20.00 Chinese B3. If the LEADE is oversized then go give the usually crappy 7.9gr CROSMAN Premier "SUPER" points a try BUT not The regular pointeds. The ones that don't shoot worth of beans in anything else but there may be hope if your barrel is oversized and too loose for normal pellets. Those Crappy CROSMAN Premier Super Points shoot great in some guns that won't shoot anything else due to oversized barrels. Good Luck. Yo!
 
Don't see any dovetails either... Strange bird you got there. I'd wedge a plastic ruler the ones you buy at the dollar store or kids school section from Wal-Mart or Office Max behind the receiver wedged inside that little crack against the stock dab a mark as an aim reference with SHARPIE go shoot then put a V notch or standard rear notch with a little file or exacto knife black SHARPIE then mark position after shooting then epoxy it since its only a $20 gun. Yo!