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11/13/2005 6:14:51 PM EDT
Could some please explain to me what the M4 extensions are for?  Do all upper come with these?  Are there any benefits?  Who manufactures uppers with these?
11/13/2005 6:25:00 PM EDT
[#1]
I think theres a thread covering all those questions somewhere?
11/13/2005 6:26:12 PM EDT
[#2]
www.ar15.com/forums/topic.html?b=3&f=118&t=191733

Read away my friend.
11/13/2005 6:28:02 PM EDT
[#3]
Thanks
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