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Here is the peg thing on the trailer.
Not sure why they use them though considering how easy it would be to break them.
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I would say if you want a mini MP10 (44?) this would be the set to get. KKB and DX9's offering probably play a lot better for prime but for me both figure look off. KKB Prime is pure beefcake, DX9 just plain cartoony instead of being based on the cartoon.