Daisy Inop 880

the piston Oring will need to be changed
https://www.daisy.com/product/o-ring-seal-kit-for-model-880-and-901/

Did you cock the hammer first? Kind of a unique quirk of these.

thom said:

I now have four 880s and none will pump up.

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Then why do you keep buying them?

c_m_shooter said:

Then why do you keep buying them?

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Because he does not have a wife to nag him into submission. I too suffer from the affliction until my wife started inventorying my air guns.

Mine was ony $35 new and it works.

Serious question though, Have any of them simply been overpumped into valve lock? I did that to my 362 when I had it out ready for a pest. Pulled it apart and used a press to squeeze the valve a vent the pressure.

thom said:

Ive never heard of that. I would like to see exactly what it is that happens.

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Just like a PCP, if there is too much air pressure pumped in, the hammer doesn't have enough energy to open the valve. On my 362, I had left it pumped and loaded for a couple days. When the intended target reappeared, I grabbed it and pumped it 8 times without thinkin. Opened the bolt and realized it was already cocked. When I tried to fire it, just click of the hammer dropping. Cocked it and tried several times. Disassembly of those is easy, just like a Discovery or 1377. The plastic clamshell styles can be a bit tricky. Good luck.