687 E.D.P - CFS weapon - (2 shot rifle)

Hey,
Just wanted to know if there is a crate where you could get the CFS rifle. I recall it could be purchased in the old CFS event last year, but I cant seem to find the rifle this time. Don't have a picture so can just say it is a 2 shot rifle for CFS. If anyone knows how to get this gun do let me know.

Thanks in advance.