Board Thread:General Nerf discussion/@comment-33092097-20190714044619/@comment-27306930-20190716112732

Three that I know of.

You can paint the cylinder, making sure to coat the inside of the chambers equally as well. This has the effect of reducing the diameter by a few hundredths. You can even use clear topcoat if you want to keep the original color.

Alternatively, you can borrow some clear nail polish and coat the inside walls of the cylinder. Clear Matte works best, but most ladies don't use that kind, so you might have to make a trip to Walmart. The advantage of this method is you can always remove it with nail polish remover if you screw it up.

And lastly my favorite, furniture polish. You put two or three coats of Minwax in each chamber and let it build up a smooth hard finish.