From reading what other people have said regarding the Alpha, you can take anything into PvP but all guns are nerfed to be equal in PvP power wise and that any effects like bleeding, fire, what have you are taken away. They seem to think that passive gun abilities are carried over like faster reloading.
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Ya certain perks worked. I had a shotgun that had certain shells that made ppl flinch/ suppressed. Pretty effective.