Board Thread:General Nerf discussion/@comment-35070608-20190103102424/@comment-27306930-20190104061039

That's cool. Like I said, the stock spring won't damage the plunger tube.

There are lots of different lubricants, but only two that are really good for Nerf blasters. The first is clear Silicone lubricant. (I tried to embed some links, but I seem to be having technical issues tonight)  I got some small tubes from NFSTRIKE last year sold as Super Lube. It's kind of translucent yellow, and invisible in small amounts. It works REALLY well.

The second is White Lithium Grease. It's available online, and at your local hardware store. It's a super slippery white cream that never dries out or gets sticky. It looks a little bit like tooth paste, and it's great for internal components that aren't exposed.

Personally, I like Silicone for externally visible parts, and Lithium for internals where I can slather it on without worrying about aesthetics.

Check out this thread and this thread for more info.