Excuse my ignorance - I’m new to airsoft after buying a job lot of guns as part of a clearance. I have (amongst others) 2 ICS guns. They came with 2 magazines with a winding wheel underneath. If I wind the mag up before inserting it it unwinds when I put it in. If I insert it then wind it up it fires 1 round then unwinds. The same thing happens with both guns and both magazines. Am I doing something wrong or does this indicate a particular issue? Thanks in advance.