Note this type 1 dogleg hammer with slot, in my Inland SG carbine 712046, its marked "GI" for Garden City Plating,
https://www.milsurps.com/images/impo...g?t=1293493778
https://www.milsurps.com/images/impo...93494092-1.jpg
Does this effect the information on 346-pg20?
