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yes both barrels are 1/2x28 TPI see ** from DB site DB1721K001 MSRP: $1.059.00 UPC: 810035755079 Finish: Black Hard Coat Anodize Caliber: 5.56 NATO Barrel: Diamondback Barrels 5.56, 16″, Medium, 4150 CrMov, Black Nitride, 1:8 RH Gas System: Carbine-Length BCG: Shot-Peened, Magnetic Particle Inspected Mil Spec 8620 Carrier Upper: A3 Flattop Forged 7075 T-6 Aluminum, T-Marked Lower: 7075 T-6 Aluminum (DB-15 Carbon Lower) Handguard: 12″ PC M-LOK Rail Grip: MOE Grip Stock|Brace: MOE Carbine Stock Magazine: Gen3 PMAG 30 Round Sights: N/A *****Muzzle Device: A2 Flash Hider (1/2 x 28) Trigger: Mil-Spec Weight: 6.3 lb Overall Length: (Stock Collapsed 32 1/2″) (Stock Expanded 35 3/4″) Additional Upper Finish: Black Hard Coat Anodize Caliber: .300 AAC Blackout Barrel: Diamondback Barrels 16″, 4140 Chrome-Moly, Free Float, Black Nitride Gas System: Carbine-Length Upper: A3 Flattop Forged 7075 T-6 Aluminum, T-Marked Handguard: 12″ M-LOK Rail Magazine: 300 Blackout PMAG Sights: N/A ***Muzzle Devi

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

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

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

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

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

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

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/

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

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

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