There is a few sites out there with similar content, but I guarantee you the best comparability because of pictures all made by the same person and identification side by side with all presented content. I will also add good information on producer, factory and belonging COO-family if known.
ACCESSORY PRODUCTION PROCESS
first I’ll try to give a very short summary about the plastic injection and its terms in regard to the production of weapons and accessories. The terms get usually wildly mixed up, so this needs clarification.
In short: There is the plastic injector and the cavity mould (made out of steel, brass or aluminium. Therefore often referred to as steel mould).
The product made out of plastic removed from the cavity mold has different signs and parts. There is the sprue, the runners, the sprue tree (runners plus sprue), the gate, the gate scar (where the gate part is cut off or ripped off, often falsely refered to as break point or injection point), the plastic product and the ejector pin marks (EPMs). Those terms are very often confused.
Ejector pins help to remove the plastic product from the cavity mold and have nothing in common with gate scars.
In terms of vintage weapons (compared to COO families) it’s important to know that weapons were not shot single. They came on sprue trees: