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Light refers to the weight (viscosity) of the oil. Really, really lightweight stuff is 0.5-1wt...heavier stuff is 5-20wt. Hobby Shops have it for RC car shocks...mostly thicker/heavier stuff (30/50/80/100+wt).
Airsoftparts.ca sells lightweight stuff.
Always use 100% pure silicone.
Lightweight stuff is great for "seeping" into cracks and not clumping up dust/dirt. Heavier weight doesn't seem to "evaporate" as quick.
Just keep in mind what you're trying to do when you're cleaning the barrel..
1. get all the dust/sand/dirt/junk out of the barrel
2. have as smooth/pristine a surface as possible
3. not scratch it up
4. not ruin your hopup rubber (physically or chemically)
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