Specifications and Features:
Black Rain AR-15 Barrel
.223 Wylde chamber
16" Slim profile
416R Stainless steel
1:8" Polygonal 3 groove rifling
Carbine length gas port
M4 feed ramps
2.15 lbs (34.4oz)

The .223 Wylde chamber allows for the use of plentiful and inexpensive 5.56mm NATO ammo, with a slightly tighter chamber tolerance than 5.56mm NATO, for improved accuracy.