Rosco Bloodline Series M4 5.56 NATO

Our Rosco 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. We are a long way from our daddy’s “Sporter” AR, and those specs just won’t cut it anymore. From properly managed dwell times for SBR’s, to running Suppressed, or setting up a balanced patrol carbine we have incorporated your needs into our engineering. We have successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel we are making (not a lazy blanket method). We have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one we want to sell you.

Barrel Length
10.5″

Barrel Weight
19.28 Oz

Barrel Length
11.5″

Barrel Weight
20.82 Oz

Barrel Length
14.5″

Barrel Weight
26.34 Oz

Barrel Length
16″

Barrel Weight
28.97 oz

Barrel Material
4150 CMV

Barrel Caliber
5.56

Barrel Profile
M4

Twist
1/7

Barrel Thread
1/2 x 28

Gas Block Size
.750

Gas System Length
Carbine

Barrel Crown
11 Degree

Barrel Finish
Nitride

Barrel Extension Finish
Nitride