I based that on 60 fills per bottle with is about what I expect for my gun, it's only an estimate though so yes, the maths is a bit iffy, but there's a lot of variables and it doesn't need to be that accurate really.


I just worked back from the compressor price. Say £300 inc P&P
I pay £7 a fill for 300Bar 12L, some people get it for £3, some have to pay £10+ then there's fuel, so £7 seems to be a happy median.

£300 / £7 = 42.9 = 43
So you can at that estimate fill the 12L tank 43 times for the cost of the compressor.
At 60 fills per tank you get 43 * 60 = 2580
Even if you estimate for 45 fills per tank you still get 1935
So given the number of assumptions & estimates I think 2000-2500 refills of the rifle is a pretty fair figure for the purpose of this discussion.

It gets better if you compare to a manual pump, which would be £80-£150 and exhausting work, certainly not recommended for the start of a shooting session. Coupled with the manual pump giving a comparable quality of air it's a lot more tempting.