Juan, they're identical except for the sights like you said. As for why the hiviz options cheaper would imagine has to do with how many buds has in stock. If buds has alot in stock the price goes down, if buds only has a few in stock price goes up. That or appears buds has been having deals on certain firearms. Whatever the reason I'd grab the cheaper ones with the upgraded hiviz sights and call it a day. Hope this helps.

Hi Juan, the core firearms are identical except for the sights as you mentioned. The biggest reason for the price difference is the number of each in stock. Higher stock items are lower priced than similar lower stock items as Buds prices are related to stock level. That said, I believe you would be better served with the Hi Viz Sight model. Cheers and stay safe!