Rosco 16″ M4 5.56 NATO Mid-Length Bloodline Barrel


16″ M4 5.56 NATO Mid-Length barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco touch as well. The longer gas system allows for a smoother gas curve which leads to managed dwell times. This combo creates a great balance of speed and performance.

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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 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
Barrel Gas Block Size  0.750
Gas System Length Mid-Length
Barrel Crown 11 Degree
Barrel Finish Nitride
Barrel Extension Finish Nitride
Weight 2.0lbs
Dimensions 19.5 x 2.3 x 2.2in

Additional information

Weight 2.3 lbs
Dimensions 20 × 3 × 3 in

1 review for Rosco 16″ M4 5.56 NATO Mid-Length Bloodline Barrel

  1. jacob_w_7 (verified owner)

    Only put a few hundred rounds thru this barrel so far but I’m very impressed. Super consistent and seems to be excellent quality.

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