.556 from M&P 15 Sport

[gr1634]

Can you use .556 in an M&P 15 .223?

 

[Bullet Bob]

Depends on the gun. You can get a lot of info by googling 5.56 vs .223. Be sure the decimal points are in the right places.

If it's for a gun you already own, the manual will probably have that information also.

 

[Pisgah]

.556? No way.

5.56? No problem.

 

[Echo40]

Check the barrel. It should be stamped with information such as the caliber and twist rate.

To my knowledge, all M&P15s are chambered for 5.56 NATO, but you can be such by checking the barrel stampings.

 

[pharmer]

Can you use .556 in an M&P 15 .223?

Europe gets guns marked .223 as 5.56 is a "military" designation. What? You thought the US cornered the market on "stupid rules." Joe

 

[Moe Mentum]

Only if the barrel is stamed 5.56, otherwise NO.

 

[1sailor]

I have an original Sport. The barrel is marked 5.56 NATO 1x9. I can't imagine yours is not as well, but it only takes a second to check. Look on top of the barrel forward of the handguard.