Thread: AR-15 parts
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Old August 2, 2010, 09:29 PM   #7
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Join Date: March 2, 2005
Location: Olympia, Wa.
Posts: 534
The M4 has 2 diffeernt chambers. You can have an M4 profile barrel with a regular feed ramp. Or you can have an M4 with an M4 feedramp. All will work on AR15's.
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