Thread: Remington 1187 bolt hold open not working

Got some spare O rings fro my 1187's a few years back from an engineering shop when they were unavailable at my LGS. They only cost me about $1.50. The ones to get are 'Viton'.
From a suppliers website:
Temperature range: From -40°C up to 250°C
Suitability: Good for use in high temperature situations or where chemicals are being used. As well as resisting oils, petrol and hydrocarbons, Viton™ is resistant to mineral acids, halogenated hydrocarbons and more.