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Beeman Beeman Chief II plus s 1336 filling

Hi all

newbie here.
I just purchased a beeman Chief II plus S model 1336.
Can anyone recommend a hand pump to fill it?
I bought a 3 stage pump but it leaks where the coupler meets the gun. The pump does not leak because I put the plug in the end and pumped it and no leak.
Maybe my fittings are in metric and the gun is imperial?

Anyway if anyone has this gun and knows what pump works that would be great.
Many thanks in advance.

Peter