M14/m1a Magazine Spring Wolff.
Extra Power Improves Relialility
Replace those old, tired, GI springs to improve function. 5% extra power assures reliable feeding in all conditions. Drop-in replacement fits 20-round magazine.
Big Book Catalog, Issue:71, Page:182
Ar-15/m16 40rd Magazine Spring Ismi.
Manufactured exclusively with aerospace-quality, chrome silicon for superior durability and performance. After winding, each spring is heat-treated, shot peened and stress relieved for long-lasting, reliability. 40-round springs should be used with green, mil-spec followers.
AR-15, Issue:10, Page:056
Big Book Catalog, Issue:68, Page:061
SPECS: Chrome silicon steel wire.