That supplier sells that same gun out to several different distributors, I have one in red, and one in blue, same gun. They use whatever parts are cheapest and readily available to produce the gun that fits the specs, so you're not going to have the consistency of the assembly like you would from a reputable brand name (even they do the same thing sometimes). You could probably buy 1 every month for a year and find some small variation in the assembly, very normal for a lot of HF products.
