I'm just going by what they say here:
What is inauthentic about the bolt carrier?Short Stroke Piston System
Hammer Forged Barrel (55.6 NATO) , 4150 Steel Nitride Treated
One Piece Bolt Carrier
1-7 Twist rate
Flash Suppressor
Proprietary RAPID CLEAN One-piece Piston System
Authentic T91 Hand Guard
Authentic T91 Charging Handle
http://www.atlanticfirearms.com/comp....html?Itemid=0
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