Genius Bonus: During Chapter 5, Sarah's weapon is described as being made up of a few specific ratios of elements, with Au.R.A. identifying the material as 'Carbonized Steel Alloy'. The ratios roughly match the composition of SAE 8620 alloy steel, a material used in cast weapon receivers. The 'unidentified elements' used to prove Sarah's story to Pietro are implied to be Molybdenum and Manganese. Sarah doesn't know what they are, though, citing that she "wasn't exactly a chemist".
