Well, whether you like it or not, I used to shoot 1 to 1.25" groups, at 100 yards, with my Yugo M48b, regularly.....stock was in original military configuration, BUT glass-bedded by me...sights were irons, BUT a somewhat special configuration I developed...
So yes wpsdlrg I can see that it can be done "WITH MODIFICATIONS
Notice: I wanted to know what the "BEST 100 YARD GROUP" was "IN ORIGINAL CONDITION". Look at my first posting! Didn't say anything about switching out the sights or glass bedding the stock or any modifications. There is no doubt those groups are possible with modern modifications, but the the fun for me is shooting it in original condition.