You may want to NOT buy a current Commercial Redfield 03A3 mount - I have bought both originals made in USAicon in the 50's and 60's by the old Denver Colorado Redfield Company and the newer Chinese made Redfields - and the originals have a slight necessary "twist" that let's them lay down flat on the receiver ring. Used Redfields for 03A3s pop up and these will fit correctly - until you can find a US GI.

The current Commercial Redfields (at least those from five years ago) DO NOT lie flat - and my gunsmith had to use a large dead blow hammer to "fit" one to my 03A3 receiver. I ultimately ended up finding an original GI NOS Lyman (used for 03A4 Rebuilds post-WWII) in the wrapper and, since I also am using a post war rebuild A4 stock on my 03A4Forgery, it drops right on. Everything except my receiver is real 03A4 - except I went with a Lyman Alaskan - much better than the Weaver scope, and also used on Armory Rebuilds. CC