To answer that part, no they didn't. The spring is quite strong. It's a fairly easy thing to rectify, basically the free length of the spring has to be reduced. Gotta get some music wire and get around to doing that.
As it is though, it works flawlessly. It's just stiffer than other rifles.
The cartridges won't pop out though since it's a mauser bolt design, the cartridge engages the rim as it's being stripped from the magazine. That would be a problem with push feed actions.