Barrel Identification

Daniel Defense is a leading manufacturer of barrels for the AR15/M4 platform. Daniel Defense currently offers barrels that are manufactured by either a button swage process or cold hammer forged. These processes are both very precise but very different all at the same time. All Daniel Defense barrels are HP and MPI tested, chrome lined, and heavy phosphate coated. Barrels chambered in 5.56mm have a threaded muzzle with 1/2x28 TPI while 6.8 SPC Barrels have a threaded muzzle with 5/8x24 TPI.

Daniel Defense has been constantly evolving the barrel identification markings, or Roll Marks, on these barrel to make them easier to identify. Below you will find a list and images of the roll marks that identify our button swage barrels and cold hammer forged barrels.

Button Swage Barrels

DDI 1/7 4150 MP
DDI 1/7 4150 MP

DD 4150 5.56 NATO 1/7
DD 4150 5.56 NATO 1/7

1X7 5.56 Nato
1X7 5.56 Nato


Cold Hammer Forged Barrels

DD 5.56 NATO 1/7
DD 5.56 NATO 1/7

DD 5.56 NATO 1/7 MM/YY (born on date)
DD 5.56 NATO 1/7 MM/YY (born on date)

DD HP MP 5.56 NATO 1/7 MM/YY (born on date)
DD HP MP 5.56 NATO 1/7 MM/YY (born on date)

DD F MP 5.56 NATO 1/7 MM/YY (born on date)
DD F MP 5.56 NATO 1/7 MM/YY (born on date)

Future Barrels will have all of the following information: DD, Construction Method (HF = Forged, BS = Button Swaged), MP, Caliber (5.56 NATO or 6.8 SPC II), Twist (1/7, 1/9, 1/11, etc), MM/YY

An example of the above would look like "DD BS MP 6.8 SPC II 1/10 MM/YY"

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