Memorial Day Savings: Take 15% Off $250+ Orders w/ Code: MD15

Memorial Day Savings: Take 15% Off $250+ Orders w/ Code: MD15

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OFF

FN AMERICA LLCAR-15 BB M4 Barrel 16 Carbine 5.56mm

Barrel Length
AR-15 BB M4 Barrel 16 Carbine 5.56mm
Brownells #
100055419
MFR #
20-100046
UPC
845737008420
$279.00
No longer available
Specifications
Gas Block Diameter:
0.750 Inches
Barrel Contour:
Government
Muzzle Threads:
1/2"x28
Twist:
1-7
Color:
Black
Barrel Length:
16.00
Gas System Length:
Carbine
Cartridge:
5.56x45 NATO
Item Length (Inches):
16.000
Make Model Fit:
AR-15.Universal
Restriction
Restricted Part:
Yes
Oversea shipping:
No
Prop 65 restriction:
Cancer & Reproductive Harm
Description

Made In The U.S.A.

Products marked with the Stars and Stripes are proudly made in the U.S.A.

Many customers have asked us to show which products are made in America, and we’ve begun working with our vendors to identify them. This information, however, is not available for all items nor does it imply that foreign merchandise is of lesser quality. We will continue to gather this information to assist our customers in making informed buying decisions, and will keep our website current with the latest information.

Guaranteed. Forever.®

We make purchasing and returning products as simple as possible. If you buy a product from Brownells and decide you don’t need it, don’t want it, or just don’t like it, we’ll take it back any time… with a few exceptions

Exceptions include: 

  • Firearms
  • Ammunition
  • Modified 80% frames & receivers 
  • Gun powder
  • Primers
  • Liquids
  • Limited Quantity/Hazardous items
  • Products that are subject to pending or implemented restrictions due to Federal, State, or Local regulation/legislation

All other products are Guaranteed. Forever.® you can easily identify these products by the Guaranteed. Forever.® Icon.

Guaranteed. Forever.

Guaranteed. Forever.® return policy applies to the product’s original owner along with proof of purchase. Any items returned within 45 days of shipment are entitled to a refund. Any items returned after 45 days of shipment will be issued store credit in the form of a Brownells Gift Card. If a Brownells/Sinclair product was purchased through another retailer as a new product we will require proof of purchase to replace or refund.  (Refund will be issued as store credit in the form of a Brownells gift card.)  

The fighting rifle trusted by U.S. troops today is the M4A1 carbine, and at the core of this light, compact rifle is a battle-proven barrel design made right here in the USA by FN America. Now, you can get your own barrel made by the same factory and enhance your stock AR-15 or build your perfect M4 clone. This is the BB M4 barrel from FN America. After button-rifling, each FN AR-15 BB M4 barrel gets a chrome-lined bore and chamber that prevents corrosion and also minimizes heat erosion. This helps to extend the life of your rifle, as well as enhance reliability. After chrome-lining, each barrel is high-pressure tested and MPI-inspected to ensure it meets all military standards. Outside, the barrels are treated with a manganese-phosphate finish that resists corrosion. These FN AR-15 BB M4 barrels are all chambered in 5.56 NATO and are available in the following barrel and gas-system lengths: 14.7-inch with a government profile and a carbine gas system, and 16-inch with a government profile and carbine gas system.

Restricted Part
Please check with your state regulations for ownership of Restricted Parts. May require documentation.

Prop 65WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

Available options: 
100055418 100055419
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