M&P 15I Chamber

[uzz75]

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.

 

[tacticool22]

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.

 

[JohnK]

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.

 

[Slats]

My 15T barrel is marked 5.56, purchased march 2010.

 

[Deaj]

M&P15's have a true 5.56 chamber.

 

[JRD]

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.

 

[armaliter]

man you can learn something everyday here. I didnt even know they had an "I" model for only .223.