Easily Select The Correct Locking Shoulder
Stepped rod with diameters from .256" to .272" lets you choose
the right locking shoulder for proper headspace. Critical for safe
function. Essential when replacing a cracked, loose or worn locking
shoulder. Use with GO/NO GO headspace gauges and a
micrometer or dial caliper to determine proper size locking
Big Book Catalog, Issue:66, Page:486
New Product Supplement, Issue:522, Page:000
SPECS: 4140 Steel. .256" (6.5mm) to .272" (6.9mm) diameter.
10.812" (35cm) long.