Could just be bad luck like you say. But looking at the pics, looks like it's got some heavier-than-necessary grease on it. Light lubricating oil is all you need there unless you do trench/jungle warfare.
While you have it out, I'd clean it all completely with CRC, get some 2000 grit abrasive paper and give all the gliding surfaces a mirror shine finish. The gliding surfaces include the pin portion riding inside the spring and the surfaces supporting the ends of the spring (springs often want to twist/untwist in compression/decompression and there is friction at the ends too therefore). That is, if you can dismantle them. I'd check with a vernier gauge how much the pin normally protrudes, in case you inadvertently alter that on disassembly/reassembly. Whether or not you go for a polishing job, it must be clean as inside a sewing machine inside a rifle bolt.
This video conveys the general idea, except I'd use 2000 grit paper.
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