For Colt .380
5% extra power replacement for weak, worn, or broken spring helps ensure reliable feeding in Colt 1911-style pistols chambered in .380 ACP. Govt 380/Mustang +2 fits Government Model and Mustang Plus 2 magazine. Mustang/Pony fits Mustang with standard magazine and Pony.
1911, Issue:11, Page:029
Big Book Catalog, Issue:69, Page:122
Sinclair, Issue:1A, Page:027