For christmas i bought myself a glock made by WE. Today i went to go and test fire it when i shot the gun the slide would not go forward all the way i had to smack the back of the slide forward so i can shoot, after each shot the slide will not go all the way forward!! I bought this gun brand new! so dissapointed please help! The spring seems kind of weak when i take the mag out and rack it maybe its the guide rod spring? Please help!