For Government & Officers ACP
.45 ACP. Extra power springs help stabilize the follower for improved feeding performance with full power loads. 8-Rd.- 5% extra-power fits newer Govt/Commander, plus Shooting Star magazines, will NOT allow 8-rd capacity in Sig GSR mags; 7-Rd.- 11 lb. rating, fits Govt/Commander, Officers ACP only, except Wilson Combat.
1911, Issue:11, Page:029
Big Book Catalog, Issue:70, Page:120
Sinclair, Issue:1A, Page:027