Glu Mobile’s Gun Bros [Free] now has even more features, including a real-time co-op element that’s sure to tickle fans of the F2P dual-stick shooter.

Available this morning, the update adds “BRO-OP,” the long-awaited co-op compliment to the game that, before, had to lean on imported AI copies of friends. The mode supports play over 3G and Wi-Fi, by the way, so all your bases should be covered.

In a cool twist, Glu has also added in voice chat to mix, which should go a long way in the coordination efforts between you and your partner.

Combat has received some attention with this update as well. At the top end, the game can now boast about having a better, more fluid auto-aim system. More importantly, it can also scream that it supports even more guns and armor. The new stuff looks just as crazy as everything else in the game. As a side-note, I’m totally stoked for that “Diabolical” set — check out those bat wings! Killer!

For the jaded among the Gun Bros crowd, Glu Mobile has also laced this update with an important new feature, Daily BRO-OP challenges. Upon completion, you’ll be rewarded with extra in-game cash, which should stave off the desire to actually buy stuff with real money to some extent.

Looking good, right? I’ll have to jump into Gun Bros again. Oh! And check out our message board thread on this update if connecting with someone is enticing to you.