Is this a quality sling?

Well I'm on a tight budget, and been having alot of bad luck lately.
I'm super scared because of my bad luck streek, that if I buy a sling and use it for my gun, it will fall and my gun will die on me.
Do you guys GUARENTEE me, that this sling will work good for my MP5?


http://www.airsoftpost.com/multipurpose-point-tactical-rifle-sling-black-p-26824.html

he's got an Echo 1 Vector Arms MP5A4, if i'm not mistaken. i reckon that'll get the job done.
but (correct me if i am wrong), i think this will work just fine.
http://www.airsoftpost.com/matrix-military-grade-single-point-bungee-rifle-sling-black-p-26829.html