I had mine for 3 years now...It's my primary most of the time since my AEG breaks down so often. I only swapped out all the hopup group which includes hopup bucking, inner barrel, nub, wheel, and the entire casing.
Everything is still going, although I don't play very often, but i swear it shot more bbs from my glock than all my "primaries" combined.
Don't upgrade durability parts until they break, there is just no point.
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