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  #1  
Old 11-03-2023, 01:54 PM
gr1634 gr1634 is offline
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Default .556 from M&P 15 Sport

Can you use .556 in an M&P 15 .223?
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Old 11-03-2023, 03:00 PM
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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.

Last edited by Bullet Bob; 11-03-2023 at 03:02 PM.
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Old 11-03-2023, 04:00 PM
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.556? No way.

5.56? No problem.
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Old 11-03-2023, 04:02 PM
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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.
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Old 11-03-2023, 04:49 PM
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Quote:
Originally Posted by gr1634 View Post
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
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Old 03-17-2024, 01:20 PM
Moe Mentum Moe Mentum is offline
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Only if the barrel is stamed 5.56, otherwise NO.
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