This is the Marushin/Enfield No.2 MK1 firing cartridge (6 rounds, triple cap + 1) made by C-Tec, a company that manufactures and sells custom parts that pursue realism in model guns and air guns and has attracted many toy gun fans.
[Product details]
Quantity: 6 rounds. Compatible with Marushin Enfield No. 2 MK1, Kokusai, Tanaka, HWS, Marushin, and other .38 caliber model guns.
This cartridge has a triple cap +1 specification, so it can use up to four 7mm cap gunpowder cartridges.
This was released in conjunction with the release of the 2-inch short barrel (tanker model). It can be used with conventional Enfield models as well as other .38 caliber model guns.
It has a realistic engraving of 380 British Service MK2 bullets.
Comes with a spring that can be used for dry firing cartridges