M4 contour lightweight carbine barrel. Chambered for the 5.56 Nato cartridge. Chrome lined with a 1 in 7 twist rate. MilSpec finish.
1/7 Twist Rate
1/2 x 28 Thread Pitch for Muzzle
5.56 Nato Chamber
.750 Gas Block Seat
M4 Feed ramped Barrel Extension
MilSpec Phosphate Coating
Weight: 1lb 12oz