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Rosco Manufacturing M4
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

Rosco Manufacturing

M4

$158.00
Available California compliant

Rosco Manufacturing Bloodline Barrel, Government Profile, 5.56 NATO, 12.5" Threaded Barrel, 1/2X28 Thread Pitch, 1:7 Barrel Twist, 4150 CMV, Carbine-Length Gas System, Fits AR15, Nitride Finish, Black BL-125-M4-556-7-C

Key Details
Brand Rosco Manufacturing
Manufacturer Part Number BL-125-M4-556-7-C
UPC 181969500036
SKU ROSBL-125-M4-556-7-C
Current Stock 8 available
Quantity Updated Jul 26, 2026 10:29 AM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

This Rosco 12.5" M4 5.56 NATO Bloodline Barrel is designed to be the ideal addition to any SBR or pistol build. The Rosco 5.56 (NATO) barrels are built to meet the needs of modern carbine shooters. They are a far cry from their predecessor's Sporter AR, and those specs just won't suffice anymore. From properly managed dwell times for SBRs to running suppressed or setting up a balanced patrol carbine, they have integrated your needs into their engineering. They have achieved this by selecting the right twist rates, gas port diameters, and barrel materials tailored to each barrel (not a lazy, one-size-fits-all approach). They also incorporate feedback from their consumers and military end users to deliver the product you need, not just the one they want to sell.

Features
  • 12.5, Carbine Gas System"
  • 1/2X28 Muzzle Threading
  • 1:7 Twist
  • 4150 CMV Construction
  • Nitride Finish
Specifications
UPC: 181969500036
Manufacturer: Rosco Manufacturing
Manufacturer Part #: BL-125-M4-556-7-C
Model: M4
Barrel Length: 12.5"
Finish: Nitride
Type: Barrel