We scar closed bolt not shooting
 

Hi all,

I purchased a we scar-L closed bolt from a fellow member here recently, was advertised as working but when I load a mag in (with the bolt back), and have a shot, the hammer strikes but doesnt seem to be hitting the valve. The bb just dribbles out and I have to recock it for another shot. No idea what is wrong....... Sometimes when i put a mag it, it refuses to "click" in place either. Something get knocked out of place during the shipping process or......?