Only have 2 mechs both clones so not much to compare to but, my first one was a ss panzer, got ripped off of eBay it was supposed to have adjustable 510 and battery connections but instead was a spring loaded 510 and didn't have the locking ring....... So while I fought the eBay seller I bought the ss / brass sentinal m16 from 101vape and that's all I use. Threads are great , locking ring is super smooth and only takes a couple of turns to lock. I only use it in 18650 mode so the telescoping feature is useless to me. And I guess the 510 is adjustable sortve as you can basically just push on the pin hard with a screw driver or pen or something and adjust is up or Down.really wanna get a stingray x or something copper but I'm not sure if I can justify it when my current setup works.
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