I've had 3 WE M4 variants in the past 2 years, not had a single problem with any of them out of the box. My second one I put 4,000 rounds + through it in a weekend at the cottage with some buddies and didn't have any issues.
Right now I have a WE CQBR and the only issue with that is Co2 mags don't seem as reliable as my old GG ones. Other than that I've had zero complaints about the WE system.
Getting parts was easy as hell, and there's plenty of WE related items that come up in the classifieds.
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