SI Defense barrels come ready to go with the barrel extension already installed. The SI Defense 20" HBAR Contour Barrel is made from 416 Stainless Steel and button rifled with a 1 in 8" twist to reliably stabilize heavy match bullets and the barrel also features a 223 Wylde chamber for enhanced feeding reliability. Muzzle threads are standard 1/2"-28 thread pitch and barrel has the extension already installed. The SI Defense HBAR Contour barrel drops to a standard .750" at the gas block which allows for a great variety of gas block styles to choose from. All SI Defense components are proudly made in the USA.
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