The KWC Python 357 Revolver is one of the loudest and most powerful 2.5 inch revolvers out there. 1 BB is inserted into the tip of the 6 shells it comes with. You fit it into its speed loader, load the 6 rounds and off you pop!
The revolver is made out of metal to withstand the pressure the CO2 has to offer, expelling a BB at around 400 fps, which is extremely powerful for a revolver this short. It may not be the most practical revolver out there, but the material and its functionality will give it a sense of realism other revolvers do not have.
It may fall short of more expensive gas pistols from Marushin and Tokyo Marui in terms of performance, but it makes up for it in weight to deliver good clean fun at a fraction of the price!