Bit of advice please guys.

I picked one of these up today for a bit of a bargain. A work colleagues son had it and was being somewhat foolish with it. Now for the probably very obvious question...


Do you load the magazine from the top, by pulling down on the main spring and individually loading the BB's or do you fully retract the spring and load from the bottom of the mag? Both ways seem to work but which way is correct?

Thank you in advance.