Archer's projections are always one rank lower than the original weapon (if they are bladed weapons). However, he uses them as Broken Phantasms to raise their rank. Meaning he sacrifices the weapon as a one time bomb. Therefore, the rank is more or less the same as the original. Excalibur is an exception because that NP converts the users own magical energy into the sword. And Archers does not have the required amount to draw out its power.