Description This barrel does not come with front sight parts or sling swivel installed (must purchase separately) – 4150 CMV Melonite – QPQ Corrosion Resistant Finish – QPQ M4 Feed Ramps Extension – Carbine Gas – 1/7 Twist – 1/2×28 Muzzle Thread – Pinned F-Mark Front Sight Base – Gas Port Size .078 B556103FSB 736684138837 ALL NFA RULES APPLY It is the customer’s responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16″. Federal NFA regulations are applicable to this item. Handling firearms or firearms parts can expose you to lead, and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).
