I thought the M60 was a weird choice. But maybe for someone who doesn't have much gun knowledge it makes sense he would pick the biggest gun he could get, not realizing it's more of a support weapon. He needs something agile and light like the MP5, or maybe the AK-S.
M60 is a crew based weapon and a newbie might get killed before even has a chance to use it. The writing on Breaking Bad is so good I'll bet there's a semi-comical scene when he tries to work that thing for the first time.
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