Guys I was Playing war zone firefight and noticed a grunt had a wierd weapons so I shot him and got a weapon with no model that fired like plasma launcher to further check I thrusted and had the model of a launcher
Yes, we know, we’ve seen this before.
I would suggest using the Search feature at the top of the thread before posting, to make sure that there aren’t any repeat threads. This particular topic has been covered many times in the past days.
In any case, it’s cool that you found it! 
Thank you and I’ll check next time to not repeat a topic