The LLV uppers that can be purchased separately are the very same LLV uppers used with Volquartsen's Scorpion and Black Mamba pistols, which are currently available in a number of different finishes, e.g., black anodize, Cerakote in OD green, flat dark earth, and an American Flag pattern, and lastly their "Battleworn" nickel boron finish.
There's virtually no difference between uppers other than the Mark series pistols that they're designed to work with, the two lengths that they're available in (4.5" and 6"), and the coating applied to them. The straight nickel boron LLV plated upper seen on my pistol at the beginning of this thread is a previous finish that Volquartsen offered before they decided to offer their Battleworn type nickel boron finish instead, a finish that's become more and more popular in recent years.