16" Gov'T/Socom 5.56 NATO Mid-Length 4150 QPQ

Name: 16" Gov'T/Socom 5.56 NATO Mid-Length 4150 QPQ
Brand: Faxon Firearms
Availability: InStock

Faxon Firearms · Barrels

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Best price

$161.00at Brownells

In stock checked Oct 1, 2026

Buy at Brownells

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Where to buy

Store	Price	Availability	Buy
Brownells Best price	$161.00checked Oct 1, 2026	In stock	Buy at Brownells
OpticsPlanet	$171.00Salechecked Oct 1, 2026	In stock	Buy at OpticsPlanet
Ammunition Depot	$171.00checked Oct 1, 2026	In stock	Buy at Ammunition Depot
MidwayUSA	$171.00checked Oct 1, 2026	In stock	Buy at MidwayUSA
GunMag Warehouse	$171.99checked Oct 1, 2026	In stock	Buy at GunMag Warehouse
Battlehawk Armory	$131.45Salechecked Oct 1, 2026	Check store	Buy at Battlehawk Armory
Palmetto State Armory	$161.99Salechecked Oct 1, 2026	Check store	Buy at Palmetto State Armory
Faxon Firearms	$169.00checked Oct 1, 2026	Check store	Buy at Faxon Firearms

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Lowest in-stock price in the last 30 days: $161.00 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$171.00	$171.00	$171.00
Battlehawk Armory	$131.45	$131.45	$131.45
Brownells	$161.00	$161.00	$161.00
Faxon Firearms	$169.00	$169.00	$169.00
GunMag Warehouse	$171.99	$171.99	$171.99
MidwayUSA	$171.00	$171.00	$171.00
OpticsPlanet	$171.00	$171.00	$171.00
Palmetto State Armory	$161.99	$161.99	$161.99

Since Sep 27, 2026.

About this part

The 16" Gov'T/Socom 5.56 NATO Mid-Length 4150 QPQ is a 16" 5.56 / .223 barrel from Faxon Firearms with a mid-length gas system. It's sold by 8 stores (5 in stock), from $131.45 to $171.99. The lowest in-stock price in the last 30 days was $161.00 at Brownells.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Mid-length · Handguards
Barrel length: 16" · Handguards

Specifications

Manufacturer: Faxon Firearms
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 16"

From the manufacturer

Faxon’s Gov’t / SOCOM 5.56 AR-15 barrel profile is a mix of the standard M4 profile and a heavy profile - skinny behind the gas block with a thicker O.D. ahead of it for a good balance of rigidity (for accuracy) and manageable weight. Machined from 4150 CMV carbon steel for an excellent balance accuracy and longevity, and QPQ Nitride coated inside and out for amazing corrosion resistance and durability.

All Faxon Gov’t / SOCOM 5.56 AR-15 barrels are fully stress-relieved, air-gauge tested, and individually checked for headspace by precision custom hardened gauges. They are put through a battery of tests at each operation until they a final inspected and allowed out the door.

Rifling: 1-8" twist, button rifled
Profile: Gov't/SOCOM
Inside Finish: QPQ Nitride
Outside Finish: QPQ Nitride
Muzzle Thread: 1/2"-28 tpi
Gas Block Shoulder Diameter: .750"
Gas Port Diameter: .081"
Gas Block Journal Length: 1.9"
Magnetic Particle Inspected!
11-degree Target Crown

All Gov’t / SOCOM 5.56 AR-15 have M4-type feed ramps in the barrel extension to aid in reliable chambering of each round.

Big Book Catalog, Issue:70, Page:018
Big Book Catalog, Issue:70, Page:019