there IS a difference. From what I've seen, increases in prices results in better materials and better manufacturing process. The final products on more expensive parts are typically finished much nicer than cheaper alternatives.
Also, regarding performance, there is a difference between brands. Personally, I look for increased velocity consistency first and reduced battery wear second when I pick the parts for my guns and ALL my guns have a Frankenstein mish-mash of gearbox parts.
I've done a lot of quantitative testing on a lot of parts, and you definitely can't go "wrong" with any of the FTK's available. I haven't done any durability tests, but I have noticed that Systema parts consistently have higher consistency than their cheaper counterparts.
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