That's great to know. The SX-4 also shares many parts with the Maxus Silver as my previous post indicated. But not the gas piston as you pointed out.
My understanding is the SX-3 is a superior design to the SX-4. What's your take on that?
The Maxus and Silver are two entirely different models the Silver uses the same internal components as the SX-3 and shares some internal parts with the SX-4, including the gas piston. The Maxus uses an entirely different set of internal components than the SX-3 or SX-4. The SX-4 and Maxus have very few if any parts in common.