FITS: AR-15 - Common Parts, .223
Fully machined barrel extension makes it possible to fit truly custom barrels to AR-15 rifles and carbines. Provides the custom rifle builder additional options when selecting caliber, contour or twist rate. M4 ramp cut.
AR-15, Issue:10, Page:019
Big Book Catalog, Issue:67, Page:020
Big Book Catalog, Issue:67, Page:605
SPECS: 4140 cm steel, in-the-white. .8125"-16UNF thread.