What thread pattern do the barrels have and are they the same?

I would contact Diamondback to be sure https://diamondbackfirearms.com/contact/

No worries Randy my man. I like the fact that we keep each other honest Sir. Lol! Cheers my friend!

james I agree it could be Diamondbacks mistake take care friend I did see that the ACC 300 package is the 1/2 by 24

All, 300BLK is 30 Caliber same as 7.62. Diamondback does not sell any 1/2x28 300BLK Barrels. Only 5/8x24 Barrels in 300BLK/.308. Contact them and when they let you know, just report back. I'm all in for correct information. Anyone can make a mistake. You, me, Diamondback as well. Either you or I will be conceding an apology my friend. Either way, cheers and happy holidays to all! DB made an error on their website (Similar package with correct specifications): https://diamondbackfirearms.com/portfolio/db15ccmlu300bfb/

My apologies. By model number the thread pattern is the same on this combo. 1/2x28 is correct.

tom H not according to the diamondback site please show where you got the sizes according to diamondback they are both 1/2x28 see my answer

Not the same. .556 is 1/2x28. .300 is 5/8x24.

james G not according to the diamondback site please show where you got the sizes according to diamondback they are both 1/2x28 see my answer

Hi Terry and welcome. The 5.56 barrel is Thread Pitch:1/2×28. The 300BLK (Threaded 5/8x24). Cheers and happy holidays!

M-Lok connectors on the barrel grip?

Erik, yes sir, the both barrels come with 12″ M-LOK Rail handguard. Stay safe & have a great day!

they have M-lok rails on the foregrips

Hi Erik and welcome. Yes, both have M-LOK Handguards. You will need various length M-LOK Picatinny Rails to add accessories. You can choose the lengths needed here : https://www.budsgunshop.com/search.php/q/m-lok+picatinny+rail+slots --- Cheers and stay safe!

If you mean are the actual mlok connectors included that's a no. If you need them for any attachments here's a link to purchase separately. https://www.budsgunshop.com/product_info.php/products_id/30190/grovtec+rail+mlok+3.8+9+slot

This dose come with both uppers right

Joel, yes sir, you get both uppers, 5.56 and .300 Blackout. Stay safe & have a great day!

Yes, you get both Uppers. Full description on both below. Diamondback Firearms DB15 rifle uses a gas-impingement system and high quality CNC machined components. Features a 4140 chrome moly barrel, A3 Flattop upper receiver, carbine length gas system, 12" M-LOK rail, MOE grip, A2 Flash hider muzzle and a Magpul MOE Carbine stock. Made in the USA. This model comes with a compatible upper assembly chambered for 300 Blackout. Diamondback Firearms Item Number: DB1721K001 Semi-Automatic AR-15 Rifle 5.56x45mm NATO (also accepts .223 Remington) 30 Round Magazine 16" Chrome Moly Steel Barrel, Black Nitride Finish Carbine-Length Gas System Forged Aluminum Lower Receiver Forged Aluminum A3 Flattop Upper Receiver Optics Ready 12" M-Lok Rail Mil-Spec Bolt Carrier Group Magpul MOE Pistol Grip Magpul MOE Carbine Stock Standard Trigger A2 Flash Hider Weight: 6.7 lbs Black Finish .300 Blackout Complete Upper Assembly Specs: Caliber: .300 AAC Blackout 16" Chrome Moly Steel Barrel, Black Nitride Finish A3 Flattop Forged Aluminum Upper Receiver Optics Ready 12" M-Lok Rail A2 Flash Hider Black Finish

Hi Joel and welcome. Yes, both uppers are included. This 5.56 NATO semi-automatic rifle also comes with a separate complete upper assembly that's chambered in the increasingly popular .300 Blackout caliber. You'll be able to quickly switch from one caliber to the other with ease by simply pushing out a couple of pins and popping the other upper onto the lower. Both upper assemblies feature 16" chrome moly barrels with black nitride finishes and 12" M-LOK handguards which allow for the easy addition of any M-LOK compatible accessories. Cheers!

BudsGunShop.com uses cookies to ensure you get the best experience. Details can be found in our Privacy Notice.

Got It!

Diamondback DB15 Combo 5.56x45mm NATO,300 Blackout 16" 30+1 Black Hard Coat Anodized Rec Black Adjustable Magpul MOE - 16" Barrel, 30+1 Rounds

Name: Diamondback DB15 Combo 5.56x45mm NATO,300 Blackout 16" 30+1 Black Hard Coat Anodized Rec Black Adjustable Magpul MOE
Brand: Diamondback Firearms
SKU: 148126
Availability: InStock

Reviews| 3 Questions & Answers

Model: DB1721K001

Condition: Factory New

Bud's Item Number: 148126

UPC: 810035755079

MFG: Diamondback Firearms

Questions & Answers (3) Reviews 0 out of 5

Diamondback DB15 Combo 5.56x45mm NATO,300 Blackout 16 30+1 Black Hard Coat Anodized Rec Black Adjustable Magpul MOE

View Product Videos

**Mouse over image above to zoom any area, or click on image to zoom the entire image.

Diamondback DB1721K001 DB15 Combo 5.56x45mm NATO,300 Blackout 16" 30+1 Black Hard Coat Anodized Rec Black Adjustable Magpul MOE

Product Information

Action

Caliber

5.7mm x 28mm

Barrel Length

18.6

Capacity

Length of Pull

Product Information

Action

Semi-Auto

Caliber

300 AAC Blackout

Barrel Length

Capacity

30+1

Length of Pull

N/A

FREE SHIPPING New and used firearms SHIP FREE compliments of ShipMyGun.com. This excludes long guns shipping to AK, HI, and US Territories.

Next Day Shipping TB Only Next Day Shipping for TEAM BUDS Members that ...
Order before 12:00 PM ET, Pay with Credit Card, and pick a valid FFL we already have on file

Layaway AvailableLayaway is Available on this Item.

$844.99

Cash discount Price

$870.34

Retail Price

$844.99
Cash Discount Price

$870.34
Retail Price

FREE SHIPPING New and used firearms SHIP FREE compliments of ShipMyGun.com. This excludes long guns shipping to AK, HI, and US Territories.

Financing as low as
$90.34 per month
Click here to learn more

Payments as low as $90.34 per month

Add To Wish List

Ask the Community

FREE SHIPPING New and used firearms SHIP FREE compliments of ShipMyGun.com. This excludes long guns shipping to AK, HI, and US Territories.

Next Day Shipping TB Only Next Day Shipping for TEAM BUDS Members that ...
Order before 12:00 PM ET, Pay with Credit Card, and pick a valid FFL we already have on file

Layaway AvailableLayaway is Available on this Item.

Retail Store Availability

In-Store Purchase Only
Lexington, KY	Not in store
Greenville, KY	Not in store
Sevierville, TN	Not in store

Questions & Answers

Q: What thread pattern do the barrels have and are they the same?
Answered

Asked 12/30/2023 15:35 by terry h

A:

I would contact Diamondback to be sure https://diamondbackfirearms.com/contact/
See 10 more answers |
Q: M-Lok connectors on the barrel grip?
Answered

Asked 11/13/2023 13:30 by Erik L

A:

Erik, yes sir, the both barrels come with 12″ M-LOK Rail handguard.
Stay safe & have a great day!
See 3 more answers |
Q: This dose come with both uppers right
Answered

Asked 09/30/2023 04:27 by Joel H

A:

Joel, yes sir, you get both uppers, 5.56 and .300 Blackout.
Stay safe & have a great day!
See 2 more answers |