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111111111B-500×500

4150 Chromoly Steel
M4 Contour Profile
M4 Feed Ramps
5.56/.223 Chambered in 5.56×45
Markings Spiral Engraved Near Break
Carbine Length Gas System
1:7 Twist
.750 Gas Platform System
Black Nitride Coating
1/2 by 28 Thread