Nemrod Pneumatic Speargun Piston Construction

  • As people are often trying to resurrect Nemrod pneumatic guns by replacing or repairing the pistons this post describes how the pistons were made.


    Here is a diagram of the Nemrod piston and how they were assembled out of several sub-components using steel, aluminium (the spacers originally, later stainless steel) and ribbed rubber cups seals to stop the piston rocking in the bore. The rubber ribs provide six circumferential sliding points of contact, but only the rear rubber seal trailing lip flares with air pressure against the inner barrel wall, the front seal serves as a barrel wiper. Sometimes it is possible to extend piston life by transposing the rubber seals, as the front seal has an easier life, never being exposed to compressed air pressure.

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