Jeremy, the upper is switchable with a 5.56/223 upper no problem. I own a similar DB15 but in 5.56 and can attest to quality workmanship. I have just under a thousand rounds through it so far with no issues. I'm currently saving for a DB-10 in 308 or 6.5

Diamondback Firearms DB15 AR-15 DB15EML300B

Name: Diamondback Firearms DB15 AR-15 DB15EML300B
SKU: 14734
Rating: 5 (2 reviews)

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2 Reviews

MSRP:

$459.90

Used Price:

$459.90

Sale Price:

$511.00

Diamondback Firearms DB15 AR-15 DB15EML300B Gun Stats

Diamondback DB15 AR-15

Palmetto State Armory

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DIAMONDBACK FIREARMS LLC 300 BO Keymod Diamondback DB15E300ODG DB15 300 BO Keymod Semi-Automatic 300 AAC Blackout/Whisper (7.62x35mm) 16\" 30+1 Magpul CTR ODG Stk Black Diamondback\'s DB15 rifle is made entirely in the U.S.A., starting with the tried-and-true U.S. Military-proven gas impingement system and using only the highest-quality components machined in Diamondback\'s CNC facility. This rifle features a 16\" free-float, melonite-coated, chrome moly barrel with an A2 flash hider. The forged 7075 T6 aluminum receiver has a T-marked A3 flattop. It uses a Magpul CTR buttstock and Mil-Spec buffer tube with a Diamondback aluminum modified 15\" keymod rail and Magpul MOE pistol grip. It comes with a 30-round Magpul PMag with window. SPECIFICATIONS: Mfg Item Num: DB15E300ODG Category: RIFLES CENTERFIRE TACTICAL Action :Semi-Automatic Caliber :300 AAC Blackout/Whisper (7.62x35mm) Barrel Length :16\" Capacity :30+1 OAL :32.5\"-36.25\" Weight :6.65 lbs Stock Description :Magpul CTR OD Green Metal Finish :Black Muzzle :A2 Flash Hider Receiver Material :7075 T6 Aluminum Sights :None, Optic Ready Barrel Description :4150 Chrome Moly Twist :1:8\" Hand :Right Stock Finish Group :Synthetic Metal Finish Group :Blued/Black