Stock is only superior for AR and LMG to compete with SMG. and that is a required attachment that gives them one less attachment option to play with so no it's definitely not to good (it was pre patch on SMG). You don't even need attachments on SMG to be honest and as far as suppressor it's hit and miss for me. I like it on AR and LMG but I haven't really had much success with it on SMG, I feel like I'm getting outgunned all the time by non suppressed SMG users.
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