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5.56mm NATO (accepts .223 Remington) ---Specifications and Features: DPMS Recon RFA3-REC 5.56mm NATO (accepts .223 Remington) 16" HBAR bead blasted 416 Stainless Steel Barrel 1:9" Twist rate Mid-Length Gas System AAC Flash Hider Forged 7075 T6 Lower Receiver Forged 7075 T6 A3 Flattop Upper Receiver Magpul MOE Collapsible Carbine Stock Magpul MOE Pistol Grip Mid-length free float quad rail Magpul MOE MBUS sights Standard AR-15 Fire Control Group Overall Length 33.25" Collapsed, 37" Extended Overall Weight 7.65 lbs

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This rifle is chambered for 5.56 NATO and will handle the extra pressure for which it was designed Gabriel.

The pressures are similar between the 2 cartridges they are measured on different scales(same velocities equal same pressures). The depth the bullet is seated to is the main difference which can cause excessive pressures when 5.56 is fired in some .223 chambers. This rifle has the 5.56 chamber and will shoot both cartridges.

The pressures are similar between the 2 cartridges they are measured on different scales(same velocities equal same pressures). The depth the bullet is seated to is the main difference which can cause excessive pressures when 5.56 is fired in some .223 chambers. This rifle has the 5.56 chamber and will shoot both cartridges.

It a 5.56 NATO rifle -Specifications and Features: DPMS Recon RFA3-REC 5.56mm NATO (accepts .223 Remington) 16" HBAR bead blasted 416 Stainless Steel Barrel 1:9" Twist rate Mid-Length Gas System AAC Flash Hider Forged 7075 T6 Lower Receiver Forged 7075 T6 A3 Flattop Upper Receiver Magpul MOE Collapsible Carbine Stock Magpul MOE Pistol Grip Mid-length free float quad rail Magpul MOE MBUS sights Standard AR-15 Fire Control Group Overall Length 33.25" Collapsed, 37" Extended Overall Weight 7.65 lbs