I'm considering buying a BAM 51. Can I use the "FX" type pump to fill it? Is there another maybe cheaper option except the SCUBA cylinder?
FX pump should work.
Works Fine. I used one on my BAM when I still had it.
Do I need any extra pipes or fittings? Or will it work straight from the box?
Yes, for a pump you need a Foster coupling. For dive tank you'll need the filling adapter + coupling