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.
AR-15, Issue:09, Page:018
Big Book Catalog, Issue:66, Page:018
Big Book Catalog, Issue:66, Page:600
SPECS: 4140 cm steel, in-the-white. .8125"-16UNF thread.