My first snake that I got when I first got into the hobby was a boa constrictor that I had bought off of a shady guy at an expo for a low price. The guy had originally told me it was an Argentine Boa, which not knowing any different I just assumed he must be. But after being in the hobby longer and acquiring more snakes I can see that he isn’t an Argentine. He almost makes me think of a IMG/Jungle but I’m still learning about boas so I don’t know. He’s a beautiful snake and I’d love to breed him eventually, but don’t want to do so without having some kind of idea what he is. So any help would be appreciated.
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Definitely agree he’s not an Argentine. I’m far from an expert, but he looks like a normal/wildtype BI to me. He’s definitely on the darker side, but his pattern and overall colour pallette don’t really look like IMG to me.
Jungle I’m less sure about. He could maybe be a low expression Jungle, but I’m not that good at identifying the subtitles of Jungle. I’ll tag @tommccarthy, as he works with Jungle.
He’s a beautiful boa, whatever else he may be!
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I can’t help you with your question but @jawramik has tagged Tom McCarthy who is one of our boa experts here. However I wanted to chirp in to say what a gorgeous animal that is! I have a penchant for any dark snake and that one suits me to a T! Or should I say B for Big Beautimus Boa!!! 
You are blessed to have that guy!
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I would say he is a BCI Mexican boa.
I am old school. I still call BI boas BCI but they are the same thing.
He is definitely not an Argentina boa or jungle or IMG morph boa.
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I really appreciate everyone’s input and insight into this for me! Definitely gives me more to dive into with learning about these guys. It’s certainly a lot of information to take in once you start looking into it, even just boas and ball pythons that I’m currently developing into.
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We all appreciate your pictures! Please don’t hesitate to post a “photo dump” any ole day of the week! 
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