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Complete Sharps Bros SBUR04 upper with 15" full top rail handguard. 

16" AR15 Upper, .223 Wylde CAL (suitable for 223 Rem or 5.56), 15" Handguard, M16 black DLC coated BCG, Radian Charging Handle, Mid Length Gas System.  

Full Top Rail.  MLOK 7 sides. 

Total Weight of complete upper (including BCG and charging handle): 4lbs, 3.3 ounces

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Additional Barrel Specs:

100% US Made from 4150 CMV Material

29 ounces

1:7 RH Twist

Gas Block Journal: .75"

1/2-28 barrel thread

Black Nitride finish

M4 Barrel Extension