Hfc Hg170 Help Newbe

[Chris55]

Right long shot 

got a hg170

fill mag up and it dont pick bbs up and fires on auto no single shot 

when trying with no bbs the slide dont hold open like shoud wen out of bbs

just slife keeps sliding i have no idea whats going on help please

 

[Chris55]

Update 

if i cock the gun then fire it dose actualy fire the bb out

  but continues to fire and not pickup bbs like its on rapid fire

every time i cock it works 

any help please