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  #1  
Old 12-17-2010, 03:41 AM
uzz75 uzz75 is offline
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Someone can verify with go/no-go gauge is the 15I is really only .223 and not 556 ?
Thanks
I'd like to buy it.
Thanks
Michele.
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  #2  
Old 12-24-2010, 03:32 PM
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tacticool22 tacticool22 is offline
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If it's stamped into the barrel .223, then that is what it is. The lower receiver has no bearing on what the upper can shoot.
Don't shoot 5.56mm in a .223.
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Old 12-25-2010, 10:24 AM
JohnK JohnK is offline
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I believe that ALL M & P 15's were made with a 5.56 chamber.

As noted above, the barrel should be marked 5.56.
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Old 12-25-2010, 11:48 AM
Slats Slats is offline
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My 15T barrel is marked 5.56, purchased march 2010.
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  #5  
Old 12-25-2010, 07:40 PM
Deaj Deaj is offline
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M&P15's have a true 5.56 chamber.
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  #6  
Old 12-27-2010, 09:44 PM
JRD JRD is offline
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The "I" in M&P-15I is for "International". They are chambered in 223 not 5.56. They are for export to countries that do not allow folks to own 5.56.
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  #7  
Old 12-28-2010, 04:50 PM
armaliter armaliter is offline
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man you can learn something everyday here. I didnt even know they had an "I" model for only .223.
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