I am not sure about the price or accuracy of the Gibbs rifle, but National Match Armory builds highly accurized Springfield, and Garand, target rifles, Kreiger barrels, etc. that typically shoot closer than 1 MOA. They have on occsion built replica Garand, and I think A4 Springfield, snipers to customers orders. It is another option to consider if you decide you really have to have an A4 replica.

Check out their Springfields and Garands at http://www.nationalmatcharmory.com/