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FN America FN20-100042
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.

FN America

$299.00
$279.00
Sale Price
Available California compliant

FN America Barrel, 18", 5.56 NATO, 1:7 Twist, Button Broached, Rifle Length Gas System, M16 Contour, Fits AR-15, Matte Finish, Black 20-100042

Key Details
Brand FN America
Manufacturer Part Number 20-100042
UPC 845737008468
SKU FN20-100042
Current Stock 9 available
Quantity Updated Apr 23, 2026 12:40 PM
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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

FN AR15 premium button rifled barrels are manufactured using U.S. sourced Chrome Moly Venadium material per Mil-B-11595E. Each barrel is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to ensure that it is free of micro-stresses or flaws, resulting in consistency and quality in every barrel shipped from the factory. The bore and chamber are chrome lined to help resist corrosion and provide resistance to heat erosion which greatly improves barrel life and reliable chambering / extraction. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. Currently available in a chambering of 5.56 x 45mm in the following profiles and gas system lengths 10.5" Government Carbine, 14.7" Government Midlength, 14.7" M4 Carbine, 16" M4 Carbine, 16" Government Carbine, 16" Government Midlength, 18" Government Rifle, 20" Government Rifle.

Features
  • 556 NATO
  • Rifle Length Gas
  • MPI and HPT
  • Chrome Lined
  • 18"
Specifications
UPC: 845737008468
Manufacturer: FN America
Manufacturer Part #: 20-100042
Barrel Length: 18"
Type: Barrel