Just picked this up at my local FFL, getting ready to fire it for the first time but I can't tell if this is 5.56 or .223. The barrel is not marked, and the only marking is on the magwell/lower. Some sites say .223/5.56 while others say 5.56 that can shoot .223. I've heard there are issues if you shoot enough 5.56 through a .223 chamber, but this is all new to me so I'm lost. Anyone know if this is 5.56 that can support .223, or is this a .223 that can sometimes shoot 5.56?

Question

Steve P. · Answer

Its .5.56mm NATO Caliber Rifle (accepts .223 Remington)

Steve P. · Answer

Hi Matthew Its chambered in .5.56mm NATO Caliber Rifle (accepts .223 Remington) -- Specifications and Features:
Windham Weaponry CDI R16M4SFSDHT-- 
>>>>>>>> .5.56mm NATO Caliber Rifle (accepts .223 Remington) --
Semi Automatic Direct Gas Impingement System --
Forged 7075 T6 Aircraft Aluminum with Trigger Guard --
Hardcoat Black Anodized Finish--
M4A4 Type Flat Top Upper Reciever --
16" M4 Profile Chrome Lined with Vortex Flash Suppressor --
1:9" Twist Rate --
4150 Chrome Moly Vanadium 11595E Steel with M4 Feed Ramps --
Diamondhead Free Float Forend --
Magpul AFG --
Magpul MOE Black Pistol Grip --
Diamondhead Dual Aperture Flip up Sight --
Diamondhead Front Flip up Sight --
Overall Length 36.125"(with Stock Collapsed 32.375") --
Weight Without magazine 7.025 lbs --

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