From what little is being written, the teams offshore are staying offshore. And they are all former professional level "security experts" who are making good money on contracted security with ships lined up in scheduling for their services.
It's not like they are dumping THEIR personal equipment. Professionals don't use AK's much. On board, the weapon of choice and experience would more than likely resemble a MK18 MOD 1, not an AK. Not many Mk18s floating around in Africa.
Not many pro's spend months in training to gain expertise and muscle memory for tactical operations who carelessly switch to a different gun with worse ergonomics, a bulkier profile, and who knows what kind of maintenance record or round count thru it. It's not the teams intent to endanger their life, mission, and crewmembers.
So, sure, if they board or repel a pirate skiff offshore, who's to know what they might keep, or simply toss on the spot? Why seize junk? Dump it.
For your consideration and offered "for entertainment purposes only":
http://glomarsec.com/
https://www.usnwc.edu/getattachment...ivate-Security-Solution-to-Somali-Piracy--The
http://www.fulcrum-maritime.com/lri...ry?OpenAgent&Category=Anti Piracy Information
http://www.icoc-psp.org/uploads/Signatory_Companies_-_June_2012_-_New_Companies.pdf
There's plenty more on the subject, including reporting incidents to an overwatch institution. We may joke about losing a firearm the last time we were on the lake, I suspect that phrases like "all known parties and their equipment were lost at sea" is fairly common.
Ya know, a lot of these guys have had AK's fired at them in anger, it's not a weapon that is welcome when seen. Bonus points to throwing them overboard at every opportunity. Or just watching them slip beneath the waves.