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"Precision barrels and AR rifles built to perform"

DIA supplies barrels and AR-style rifles, including carbine and rifle-length barrels and DB15 tactical platforms. We stock a selection of barrels in 7.62x39, .308, and .223/223 Wylde.

5.0★★★★★(5 verified DIA reviews)
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431
Products
166
In Stock
-
Founded
USA
Origin

All DIA Products (166)

Buy Diamondback DB1874K061 DB15 5.56 NATO Rifle 16" FDE Magpul Stock M-LOK Rail online Diamondback DB1874K061 DB15 5.56 NATO Rifle 16" FDE Magpul Stock M-LOK Rail Buy Diamondback Firearms DB15 AR-Style Semi-Auto Tactical Rifle .223 Remington online Diamondback Firearms DB15 AR-Style Semi-Auto Tactical Rifle .223 Remington Buy Diamondback DB1060M071 6.5 Creedmoor 20" M-Lok Semi-Auto Rifle online Diamondback DB1060M071 6.5 Creedmoor 20" M-Lok Semi-Auto Rifle Buy Diamondback DB1060M061 DB10 6.5 Creedmoor 20" 20+15+1 Flat Dark Earth online Diamondback DB1060M061 DB10 6.5 Creedmoor 20" 20+15+1 Flat Dark Earth Buy Diamondback DB10 6.5 Creedmoor 20" Black Magpul MOE Carbine Stock online Diamondback DB10 6.5 Creedmoor 20" Black Magpul MOE Carbine Stock Buy Diamondback DB1629L001 DBX57 BGFB 5.7x28mm 8" 20+1 Black Hard Coat... online Diamondback DB1629L001 DBX57 BGFB 5.7x28mm 8" 20+1 Black Hard Coat... Buy Diamondback DBX57 5.7x28mm Semi-Auto Pistol 8" Barrel Black online Diamondback DBX57 5.7x28mm Semi-Auto Pistol 8" Barrel Black Buy Diamondback DB0301P061 9mm Luger 3.5in Black Nitride 17+1 Striker Fired online Diamondback DB0301P061 9mm Luger 3.5in Black Nitride 17+1 Striker Fired Buy Diamondback DBAM29 Sub-Compact 9mm Luger Pistol with Laser online Diamondback DBAM29 Sub-Compact 9mm Luger Pistol with Laser Buy Diamondback DB0300P031 9mm Pistol 12+1/17+1 Black/Stainless 3.5" Barrel online Diamondback DB0300P031 9mm Pistol 12+1/17+1 Black/Stainless 3.5" Barrel Buy Diamondback DBAM29 Sub-Compact 9mm Pistol, 3.5" Barrel, Polymer Frame, 3-Dot Sights online Diamondback DBAM29 Sub-Compact 9mm Pistol, 3.5" Barrel, Polymer Frame, 3-Dot Sights Buy Diamondback AM2 9mm Pistol 3.5" Barrel Black online Diamondback AM2 9mm Pistol 3.5" Barrel Black Buy Diamondback DB0200P031 DB9 9mm 6+1 Two-Tone Polymer Frame Pistol online Diamondback DB0200P031 DB9 9mm 6+1 Two-Tone Polymer Frame Pistol Buy Diamondback Firearms DB9 G4 Semi-Auto Pistol 9mm Luger 3.1" Barrel (1)-6Rd online Diamondback Firearms DB9 G4 Semi-Auto Pistol 9mm Luger 3.1" Barrel (1)-6Rd Buy Diamondback DB0200P101 9mm Pistol, 3" Barrel, OD Green, 6+1 Capacity online Diamondback DB0200P101 9mm Pistol, 3" Barrel, OD Green, 6+1 Capacity Buy Diamondback DB9 Compact 9mm Pistol 3" Barrel FDE Black online Diamondback DB9 Compact 9mm Pistol 3" Barrel FDE Black Buy Diamondback DB9 9mm Pistol - Lightweight, Compact, USA-Made online Diamondback DB9 9mm Pistol - Lightweight, Compact, USA-Made Buy Diamondback DB9 Gen IV 9mm 3.1 in Barrel Black Polymer 6 Rds Striker Fired online Diamondback DB9 Gen IV 9mm 3.1 in Barrel Black Polymer 6 Rds Striker Fired Buy Diamondback DB9 9mm Pistol 3" Barrel Black online Diamondback DB9 9mm Pistol 3" Barrel Black Buy Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote 9rd online Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote 9rd Buy DIAMONDBACK DB1911 45ACP 8+1 5" Match Grade Barrel Stainless online DIAMONDBACK DB1911 45ACP 8+1 5" Match Grade Barrel Stainless Buy PROMAG Five Seven Iom And USG 5.7x28mm 20rd Polymer Black Magazine (FNH-A1) online PROMAG Five Seven Iom And USG 5.7x28mm 20rd Polymer Black Magazine (FNH-A1)

About DIA

DIA offers precision barrels and AR-style rifles designed for shooters who want reliable performance and consistent accuracy. Their product range includes short carbine barrels, pistol-length and rifle-length options, and complete DB15 semi-automatic rifles suited to tactical, range, and home defense roles. Barrels are produced in a variety of calibers such as 7.62x39, .308 Winchester, and .223/223 Wylde, with finishes like black nitride and materials such as 4150 steel. DIA components are designed to fit common AR platforms and give builders and shooters straightforward, dependable options for upgrades and builds.

Headquarters

Established

-

Country of Origin

USA

History & Heritage

DIA is known for producing barrels and AR-style firearms and components. The brand grew by offering common calibers and barrel lengths that meet the needs of sport shooters, hobbyist builders, and tactical users. Specific founding details and headquarters are not provided here.

Notable Products

DB15 AR-style rifles and the DB series barrels in 7.62x39, .308, and 223/223 Wylde

Why Choose DIA?

Choose DIA when you want straightforward, compatible barrels and AR platforms that deliver consistent performance and value.

Hot DIA Items June 2026

Trending right now based on the last 30 days of TheGunDock orders + page views.

Diamondback Sidekick Double/Single Action Revolver .22 LR/ WMR

Diamondback Sidekick Double/Single Action Revolver .22 LR/ W

$284.00
✓ In Stock · 1 sold this month
 Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote 9rd

Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote

$284.00
✓ In Stock · 1 sold this month
 DiamondBack DB15 Carbon 5.56 NATO 30+1 16 Jesse James Blue Cerakote

DiamondBack DB15 Carbon 5.56 NATO 30+1 16 Jesse James Blue C

$657.00
✓ In Stock · 1 sold this month
 Diamondback DB0300P031 9mm Pistol 12+1/17+1 Black/Stainless 3.5" Barrel

Diamondback DB0300P031 9mm Pistol 12+1/17+1 Black/Stainless

$323.00
✓ In Stock · 1 sold this month
 Diamondback 308M135M50B10 .308 Win 13.5" Barrel Black Nitride 4150 Steel

Diamondback 308M135M50B10 .308 Win 13.5" Barrel Black Nitrid

$128.00
✓ In Stock
 Diamondback DBAM29 Sub-Compact 9mm Pistol, 3.5" Barrel, Polymer Frame, 3-Dot Sights

Diamondback DBAM29 Sub-Compact 9mm Pistol, 3.5" Barrel, Poly

$285.00
✓ In Stock
 DIAMONDBACK DB10 8.6 Blackout 16in 20rd Black Semi-Auto Rifle (DB1080W001)

DIAMONDBACK DB10 8.6 Blackout 16in 20rd Black Semi-Auto Rifl

$982.00
✓ In Stock
 Diamondback Sidekick Double/Single Action Revolver .22LR/.22 Magnum

Diamondback Sidekick Double/Single Action Revolver .22LR/.22

$278.00
✓ In Stock

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Diamondback DB2380B001 .300 Blackout DB15 SBR 10" M-LOK 30rd Black

Diamondback DB2380B001 .300 Blackout DB15 SBR 10" M-LOK 30rd

$1,060.00
✓ In Stock
 DIAMONDBACK SDR 357 Mag/38 Special 2in 6rd Stainless Revolver (DB0700S701)

DIAMONDBACK SDR 357 Mag/38 Special 2in 6rd Stainless Revolve

$677.00
✓ In Stock
 Diamondback 300P10H50B8R 10" .300 Blackout Barrel 4150 CMV Nitride Finish

Diamondback 300P10H50B8R 10" .300 Blackout Barrel 4150 CMV N

$97.00
✓ In Stock
 Diamondback 762X39C10M50B95R DB Barrel 7.62x39mm 10" Carbine-Length Bla...

Diamondback 762X39C10M50B95R DB Barrel 7.62x39mm 10" Carbine

$99.00
✓ In Stock
 Diamondback 762X39P7H50B95R DB Barrel 7.62x39mm 7" Black Nitride 4150 C...

Diamondback 762X39P7H50B95R DB Barrel 7.62x39mm 7" Black Nit

$88.00
✓ In Stock
 Diamondback 308M135M50B10 .308 Win 13.5" Barrel Black Nitride 4150 Steel

Diamondback 308M135M50B10 .308 Win 13.5" Barrel Black Nitrid

$128.00
✓ In Stock
 DBB BBL 556 16" CARB MED 1-9 BLK

DBB BBL 556 16" CARB MED 1-9 BLK

$103.00
✓ In Stock
 Diamondback 223WR18H50B7R 18" Heavy Barrel 223 Wylde Rifle Length

Diamondback 223WR18H50B7R 18" Heavy Barrel 223 Wylde Rifle L

$95.00
✓ In Stock
 Diamond Atomic Bow Package Purple 12-24 in. 29 lbs. LH

Diamond Atomic Bow Package Purple 12-24 in. 29 lbs. LH

$241.00
✓ In Stock
 DIAMONDBACK DB1911 45ACP 8+1 5" Match Grade Barrel Stainless

DIAMONDBACK DB1911 45ACP 8+1 5" Match Grade Barrel Stainless

$1,970.00
✓ In Stock
 Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote 9rd

Diamondback Sidekick 22 LR/WMR Revolver 4.5" Black Cerakote

$284.00
✓ In Stock
 Diamondback DB9 9mm Pistol 3" Barrel Black

Diamondback DB9 9mm Pistol 3" Barrel Black

$271.00
✓ In Stock
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A twenty-one-mile-wide choke point has shaped the movement of goods — and weapons — across half the ancient and mode...

Shop DIA by Caliber

9mm Luger .223 Remington / 5.56 NATO 6.5 Creedmoor .300 Blackout

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