Real Tritium night sight for the Tokyo Marui PX4 gas blowback pistol.
Yes, this is actually a real Tritium capsule product. Imported from Switzerland, the Tritium sealed capsules are installed into this product to give it a permanent low-level glow for 10-20 years. Nine Ball combines the technology with their high quality housing to form a premium night sight option for the Marui Model 18.
Tritium is a radioactive isotope of Hydrogen with a half-life of 12.32 years; that means the sight will loose roughly 50% of its starting brightness in about 12 years then in the next 12 it will be down to 25% and halving so on every 12 years.
As an alpha and low level beta emitter there is simply no health risk unless you removes the capsule, break it open and ingest the contents. Otherwise, the basic radiation emission of this product is on par if not lower then the natural background radiation present in a natural environment. This means that for all intents and purposes this product is inert.
This model comes with a front single dot and rear double dot sights and the screws necessary for mounting.