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There are two different versions of Trap-Jaw as most know. Here's an example of both versions. The difference is one's arm only swivels up and down at the shoulder, while one has an extra hinge so it has the same movement as his normal arm.
The one on the left side of the photo has a gap at the shoulder joint, this is how you can tell which version you've got in package. You can only see this if you're getting them in person, when you order them online it's completely at random which you get. The one on the right has no gap in his shoulder.
