Incorrect, the Sig BDX is still legal in Colorado. They changed the definition of a smart rifle a little bit this year from saying a scope containing a ballistic calculator to a computer processor, but it still doesnt apply to the BDX according to CPW. That being said, longer term I don't think it will stay legal but at least for this year it is. Here is the email I got from them two months ago when I asked about it because of the wording change.
"Thank you for contacting Colorado Parks and Wildlife. I understand you are inquiring about Sig Sierra BDX Scope as a legal scope in Colorado.
I have shared a previous inquiry about the Sig BDX with our lead law enforcement investigator and I have been provided the following information;
One of the criteria to fit into smart rifle technology is that it has a ballistic computer. In looking at Sig Sauer's website this BDX system would
not fit into the "smart rifle" definition and thus be legal.
https://www.sigsauer.com/products/electro-optics/bdx/
There is a separate rangefinder used to determine the distance to the animal and is paired using Bluetooth technology to the riflescope to determine the exact holdover. There is also an app that is downloaded for smartphones used to bond the rangefinder to the scope.
Although Sig BXD scope is currently legal, our Parks and Wildlife Commission is concerned about the ethics of fair chase and one needs to check the regulation each year to make sure it is still legal to use in Colorado.
If you have any additional questions or comments, please feel free to contact us by phone or email.
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Bradley Gabrielski
Communication Center Wildlife Coordinator"