Yankee Hill

Yankee Hill Machine AR-15 Barrel YHM-77-TF
5.56x45mm NATO (Accepts .223 Remington)
20" 4140 Chrome Moly Steel Barrel
Diamond Fluted
Not Chrome Lined
1:7" Twist Rate
Threaded 1/2"x28
Rifle Length Gas Port
.750" Diameter Gas Seat
M4 Feed Ramps
Melonite QPQ Finish
Overall Weight 3.3 lbs