Product terms help you read a listing and ask a better question. A definition is a starting point, not approval for a particular combination of equipment.
Platform, model and generation
Platform describes the equipment system. Model identifies the product; generation or revision distinguishes versions. Use all three where available when ordering removable parts.
Caliber and projectile type
Caliber is a nominal size. Projectile type describes the form or category of the supply. Both must match the manufacturer's requirements; the same size does not approve every material or shape.
Magazine and capacity
A magazine feeds compatible supplies on some platforms. Capacity states the quantity it holds. Neither tells you whether it fits another model. Use the part number, generation and caliber.
CO2, HPA and PCP
CO2 is carbon dioxide used by supported systems. HPA means high-pressure air. PCP means pre-charged pneumatic: an airgun with a reservoir filled before use. Benjamin describes that stored compressed-air arrangement. Gas, connections and pressure requirements remain specific to the model.
Inert and training
These describe a product's intended training purpose, not freedom from impact or handling risks. The manufacturer and the program still determine what is accepted.
Compatible, included and optional
Compatible should name the supported combination. Included means supplied in the selected listing. Optional means another decision or purchase may be needed. Ask when a description mixes those meanings.
Keep the manual nearby
Use these definitions beside the product instructions. When wording is unclear, send the model and proposed part to support rather than purchasing from an assumption about the term.
For example, Milsig GD50 .50 Cal Less-Lethal Pistol names a platform and caliber. Mercury Rise IntruBuster GEN2 .68 Cal Prepared Kit also identifies a generation and a kit. Those words help describe the products; their manuals and contents still determine the actual requirements.