I think the Penta is here because of aesthetics as from most of the weapons I've found on here I do not fully agree with the implementation I feel they are liberally implemented and more chosen on aesthetics. I.E. "If the gun looks cool we'll make it work!"
I'm not against this as I want a cool looking gun but I also feel I can point out the surplus of cool looking and easy to use weaponry that exists today. I would hope the DEV team could spend a few days on Google Images and then Google Search (use the right one: https://www.google.com/webhp?hl=xx-hacker) to find some other cool weapons and cause them to perform to their IRL situations. Then we wouldn't care if an antiquated weapon was in-game, due to the reality that these weapons are inferior their use would be nearly non-existent.
Wouldn't it just be better to allow the players to accumulate parts for their arms, so they can do as they please? More and more now, we're seeing a modular transition in MMOs and IRL. So why be stuck with a weapon that you may or may not outgrow, or even see as useless? To me, that would be a better idea, than introducing something that may be outdated or obscure.
You can do alot with a Saiga 12, for example, but having the ability to keep said parts for interchangeability is not there. That in a way discourages you from collecting parts or even buying some weapons, because you may not be sure what you can do with weapon before you actually buy them.
Current IGN: Applebite: Lord of the random " 'Nade toss"