Ambidextrous Barrel Extension has specially-chamfered lugs for use with the left-handed bolt assembly. Also works with standard, right-handed bolts. Gunsmith installation required.
AR-15, Issue:08, Page:003
Big Book Catalog, Issue:65, Page:003
SPECS: Ambi Barrel Extension – 8620 steel, heat-treated and stress-relieved, in-the-white. Gunsmith installation required.