Brn-4/M27 5.56x45 16.5" Medium Chrome Lined Barrel Phosphate
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specifications

Manufacturer:

Brownells

Platform:

AR-15

Caliber:

5.56 mm NATO

Barrel Length:

16.5"

    Brn-4/M27 5.56x45 16.5" Medium Chrome Lined Barrel Phosphate

    Caliber Manufacturer Color Weight Merchant Price Merchant URL
    5.56 mm NATO Brownells None None None $279.99 Brownells Add

    Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.

    "M27" inspired 5.56x45mm Barrel for the BRN-4A(R) platform Not previously available in this configuration, the BRN-4 M27 16.5 inch 5.56x45mm NATO chrome lined barrel features a forward mounted bayonet lug. Manufactured by Faxon for Brownells, these manganese phosphate barrels are machined from 4150 chrome moly steel, and feature a precision buttoned rifle 1-7 twist bore with chrome lined 5.56x45mm NATO chamber. The bayonet lug attaches after installation of the gas block. The bayonet lug installs the same way as the gas block, with a simple coil pin driven in from the side. This makes for an extremely robust mount for a bayonet. Be sure to use a BRN-4 16" gas Mfg: Brownells

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