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Rosco M4 Barrel 556NATO 16" Barrel - Carbine Length 1:7 Twist - 4150 CV Salt Bath Nitride

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You will receive fast, free shipping for all orders over $35

Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

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Starting with one of the world’s most accurate gun barrels, Rosco Manufacturing has evolved into a complete solution for the firearm industry with a clear focus on accuracy.

All barrels are made from bar stock, gun barrel quality steel.


  • 16" M4 Profile Barrel
  • 4150 CV
  • 1:7" Twist Rate
  • 5.56mm NATO Chamber (also accepts .223 Remington)
  • Threaded 1/2"x28
  • Carbine Length Gas Port
  • Salt Bath Nitride Finish

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