M4A1 Silver... Is it worth?

OK this might be a noob question...

I have 4,000 bonus now and I'm thinking about a M4A1 Silver which needs 4,900 more bonus. I know it has additional 5 ammo and it is almost silent. However, does it have any other advantage comparing with a regular M4A1? For example, accuracy, recoil, fire rate.

Thank you for answering my question. I really need the answer.

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