Diamondback

DIAMONDBACK 5.56mm 16in Carbine Length Barrel (556C16M50B9)

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DIAMONDBACK 5.56mm 16in Carbine Length Barrel (556C16M50B9) - Barrel for AR-15 - view 1
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Diamondback

Overview

The Diamondback 5.56mm 16-inch Carbine Length Barrel is designed for optimal performance in a variety of shooting applications, featuring a carbine-length gas system that enhances reliability and reduces recoil. With its M4 profile, this barrel balances weight and rigidity, making it suitable for both tactical and recreational use. This barrel is commonly found in builds aimed at versatility, often serving as a solid foundation for standard AR-15 carbines.

Specifications

MPN556C16M50B9
Barrel Length16
Caliber5.56 NATO
Gas System LengthCarbine
FinishBlack
Barrel ProfileM4
CoatingNitride

Available Merchants(4)

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BattleHawk Armory logo
BattleHawk Armory
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$86.00
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Ammunition Depot logo
Ammunition Depot
~$28.90 est. shipping
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$98.99
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KY Gun Company
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$110.99
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Optics Planet
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$123.99
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Build history on GunPartPicker

Builders have added the DIAMONDBACK 5.56mm 16in Carbine Length Barrel (556C16M50B9) to their builds on GunPartPicker. Since April 2026, it ranks #506 of the 1,042 barrels builders have added.

It was out of stock everywhere we track every time we checked in October 2026, and today none of the 4 retailers we track has it in stock right now. Listed prices start at $86 at BattleHawk Armory for when it comes back.

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Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers

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We ranked every barrel by how often it shows up in real builds on GunPartPicker.

Read the guide: AR-15 Barrel Length & Brand Report →

Check it against the live catalog:

Frequently Built With

The part most often added in each category by the builds that include this one

Tacfire AR-15 Upper Receiver with Dust Cover and Forward Assist - UP01-C

Tacfire AR-15 Upper Receiver with Dust Cover and Forward Assist - UP01-C

Upper Receiver$75in 33% of them
Midwest Industries Quad Rail AR-15 Handguard - 15"

Midwest Industries Quad Rail AR-15 Handguard - 15"

Handguard$237in 33% of them
PSA AR-15 Complete Lower Magpul MOE EPT Edition - Flat Dark Earth, No Magazine

PSA AR-15 Complete Lower Magpul MOE EPT Edition - Flat Dark Earth, No Magazine

Lower Receiver$190in 17% of them
PSA AR-15 Bolt Carrier Group 5.56 Full-Auto Nitride MPI - 516446953

PSA AR-15 Bolt Carrier Group 5.56 Full-Auto Nitride MPI - 516446953

Bolt Carrier Group$90in 33% of them
Radical Firearms Low Profile Gas Block - .750" - Set Screw Style

Radical Firearms Low Profile Gas Block - .750" - Set Screw Style

Gas Block$16 · out of stockin 17% of them
Expo Arms Carbine Length Gas Tube - Stainless Steel

Expo Arms Carbine Length Gas Tube - Stainless Steel

Gas Tube$10in 17% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

91.7%
AR-1591.7%
AR-105.1%
AR-93.1%

Builds Featuring This Part

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Builds in the community that include the DIAMONDBACK 5.56mm 16in Carbine Length Barrel (556C16M50B9)

BuildPartsTotal
Second 5.56 build build
Second 5.56 build		20$821.79
16" SBR build
16" SBR		21$1467.25

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