Barrel Sub-Assm, 10.5" MR 4140CM SBN, 5.56mm
Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
Our products come with our Lifetime Quality Guarantee.
If this product requires an FFL to purchase, please have your preferred dealer email their FFL to FFL@sigwoarms.com and reference your name and order number so we may assign the FFL to the proper order. If this information is not submitted, shipping your order will be delayed. If you have non-FFL products in your cart during checkout, they will be shipped separately to an address of your choosing.
CAGE CODE
14AS3