Fit on Striker to Capture Spring. 

Maritime Spring Cups are your answer if water, oil or debris get inside your Glock firing pin channel, it will still function and fire.

Ghost Maritime Spring Cups come in a set of two, one for each side. It cups the striker and captures the striker spring. 

Enables your Glock to fire after been underwater and in extreme hostile environmental conditions. This allows your Glock to immediately fire if it has been in the water without having to field strip it.