Stern Defense SD AR15 Barrel 9mm 6in Black BRLINCHD1. Our barrels offer an advantage over the competition. Every stern defense barrel throat is machined deeper for a longer free bore to accommodate bullets with a longer ogive. We have found that some common defense rounds jam into the rifling before the round is fully chambered. Some of the barrels on the market do not accommodate this and will potentially result in nasty malfunctions resulting in a round being stuck in the chamber requiring manual methods to clear the malfunction. Note: Barrel comes with locating pin installed. Specifications for Stern Defense SD AR15 Barrel: Manufacturer: Stern Defense Color: Black Fabric/Material: Melonite Gun Model: AR-15 Condition: New Features of Stern Defense SD AR15 Barrel Barrel length is measured in overall length from breech to muzzle. Caliber: 9mm. Length: 4 Inches. Threaded .5-36. 1:10 TWIST. 4150 Chrome-moly steel. Melonite coating. Package Contents: Stern Defense SD AR15 Barrel What firearm models does the manufacturer say Stern Defense SD AR15 Barrel is compatible with? The manufacturer suggests that Stern Defense SD AR15 Barrel is compatible with AR-15Stern Defense BRLINCHD1: SD AR15 Barrel 9mm 6in Black