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The MA5B is a fancy gun that spits out super-strong bullets. It's only as good as the idiot holding it. If you can't aim, you're just wasting ammo and making yourself a target.
My MA5B just ran out of bullets, and I had to fight three Elites with my bare hands. Classic.
I shot a Brute in the face and missed the next one because I was too busy yelling at my squad.
The MA5B is like a bad ex, it works fine until it decides to fail you at the worst possible moment.