locking mechanisms on hinge guns
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folks,

I am coming across various doubles on the internet, can't afford one but I like to look. It occurs to me I have no idea of the types of locking mechs on these. They sometimes say what type, but I am not sure of what they are.

Does anyone have some explanations/pictures of the various types? I assume some are stronger than others, some more economical to make etc.

-Ryan