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Matt, includes a Carbine length gas system and M16 profile bolt carrier group, Mil-Spec MP tested, chrome lined and properly staked gas key.
Yes for what Daniel Deffense charges for an upper it better, "The M4A1 features a 14.5" Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Improved Flash Suppressor to meet the NFA required 16" length. Daniel Defense complete upper receiver groups come complete with bolt carrier group and charging handle." If you want really high quality upper at a better price id also look at BCM. They are top notch and usually a bit cheaper then DD Check them out here https://bravocompanyusa.com/ar15-upper-receiver-groups/
