This DPMS AP4 (NATO M4) contour AR-15 Barrel is fully chambered and ready for installation onto a host upper receiver. The 16 inch barrel features a 5.56 x 45 mm chamber, and the 1 in 9" twist rifling is capable of stabilizing light to medium weight projectiles of up to 69 grains. Barrel extension and locator pin are included and factory installed.
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