Board Thread:General Nerf discussion/@comment-33092097-20190714044619/@comment-27306930-20190716015843

The seal between the plunger tube and the cylinder ? Or the seal between the plunger head and the tube ?

As long as the foam gasket on the end of the plunger tube is in good shape, you shouldn't have to worry about that seal. Not to mention, the forward motion of the plunger forces the tube against the cylinder which only improves the seal when firing.

As far as the plunger head, the stock O-ring should be plenty good enough even for greatly improved springs.