Found m4 and already had SKS, so took M4 to hands. Later disconnected in the bushes for few mins. When connected back to the same server I saw m4 on both sides of inventory (both Inventory and Vicinity). I could detach attachments from both weapons separately, take one in the hands and second instead of SKS and so on. Don't know if related, but my sawnoff shotgun was gone from backpack after logging back in.