It was my understanding (And I could be absolutely wrong on this) that bolts without lightening cuts were strictly made for the commercial/export market... Is this accurate? Thanks, Guys!
(https://preview.ibb.co/huFM0y/1_DC176_AD_5346_4_EE4_A4_F7_9_F3_C07_ABD6_D0.jpg) (https://ibb.co/hmXODJ)
I have a few that are in full military configuration without lightening cuts, it's not just exclusive to commercial variants, it was a time and labor saving thing in later production rifles used in some different factorys.
Such as... a Chinese Public Security thumb1
(https://dl.dropboxusercontent.com/s/675ofuwaf89rwzp/HPIM0094_zpsbe007f80.jpg?dl=0)
Thanks! Good info’!
The lightening cuts went away in 1966 starting with the 11 mil series and forward.