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M4 Questions


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Hello, I'm new to forums and I have a few questions about the M4. I'm getting a m4 from my late grandpa. It is unfired and I think he bought it about 10 years ago give or take. Are there any differences between one built now and say 10 years back? Any insight would be appreciated. Also, on some m4's I see a mag tube that looks ribbed. What's that about? Thanks again


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