Bear, it is an old story about US Ordnance neglecting other weapons such as the Lewis gun in WW1 which was designed in the US and manufactured in Englandicon. The
removal from service of almost all Model 1917 rifles after WW1 to keep the native Springfield 1903.

I wrote an article for Digest Books years ago on the US High Standard and HRA T48 rifles. Even some US troops went though basic training with the T48 rifle and as
good a rifle as it tested, it was never going to be adopted. They wanted the M14icon. Even when the M14 production came to an end, there was even an attempt to
salvage the M14 by having TRW produce some examples in 5,56mm using M16 magazines. Then you have the M60.