Based on similar mechanism, model gun manufacturers have their ways
to achieve the best model gun. As blow back force is very important
for semi and full automatics, manufacturers focus heavily on cartridge
design . Lightness, powerful, jam-free and easy maintenance are aims
to design the best cartridge. Let's see how they achieve it.
A cut away view of model gun Beretta M84, note the barrel and firing pin system is different from real gun.
Most Popular cartridge system
Tanaka Parallel Division Cartridge
This new design is used exclusively by Tanaka's semi-autos. System is copied from CP-HW with some in-house improvements. Cap is placed on the prima and therefore only the valve will move when ignited. Only 5mm Cap cartridge is designed.
Number of parts: 6
Pros: very powerful, good sound and average spark, very light, easy to clean, , jam-free.
Cons: Difficult and complicated to load as it is 5mm, need cleaning very soon or jam occurs.
Marushin New Plugged Fire Cartridge
This new design is used exclusively by Marushin products. System is an improved version of Plugged Fire Cartridge. Cap is placed on the valve and therefore the valve and cap will move when ignited. Both 7mm and 5mm Cap cartridges are designed.
Number of parts: 6
Pros: quite powerful, good spark and sound, average lightness.
Cons: Difficult to load and clean as the prima O-ring can not be easily fitted. Mis-fired can happen if prima is not well placed, jam sometimes occurs.
MGC CP-HW Cartridge
This design is used by MGC itself, Kokusai, Tanaka's full-autos and Hudson. System is an improved version of CP cartridge. Cap is placed on the prima and therefore only the valve will move when ignited. Both 7mm and 5mm Cap cartridges are designed.
Number of parts: 5
Pros: very powerful, good spark and sound, average lightness, easy to load and clean, jam-free, .45 caliber is the best.
Cons: Best if lighter, .38 super caliber has feeding problems, O-ring detachment in 5mm cartridge.
MGC's development of cartridge
Before "Plastic Cap" was invented in 1981, "Paper Cap" is the only power source of model gun. Compared with Plastic Cap. Paper Cap is difficult to load and clean, and performance is pretty inconsistent. As soon as Plastic Cap (Cap) was invented, original CV cartridge was further re-designed to suit. MG cartridge is the result.
Marushin's development of cartridge
Marushin had made a movement toward cartridge design after plastic cap was invented. Plugged Fire Cartridge is the result.
Little tips on autos cartridge