I plugged in a controller, moved left, and it started working. Weird bug but easy fix.

The crash stopped happening randomly.

Reinstalling game, then switching to stress test fixed the crash.

I have not been able to get the sporter and a mag yet. I have shot rapidly around many other players (6 person firefight at NWAF) that did not cause a crash. I have shot a RAK in the same position in Cherno at the fence and it did not cause a crash.

This is in experimental.

I think I have some insight. The issue seems to be based on desync with a server thinking a door is closed and it is open for the client. If you run into the building, it triggers the stretching desync. I have only seen this bug when entering a building.

https://drive.google.com/open?id=0B1apNmUf7GgFMzNpb3RlYkdTREE

I also had the same problem using the same steps. I was not able to replicate it on my second attempt though. It might be related to the floor you are throwing on.

and again. The servers are dropping immediately when I shoot a sporter (30 round mag with 20 bullets) until the mag is cleared. I was unable to replicate the crash when I was east of balota airfield. I shot through a fence and unloaded the mag. However, in a small firefight in balota town, the game crashed. This could have something to do with other players having to hear the rapid shots. I will continue to investigate.

was able to replicate again. So 3 out of 4 times so far.