I don’t have many details yet but pictures of the upcoming AR15.com Ambidextrous Billet Lower Receivers have been released.
Roger at Battle Arms Development tells me that these lowers have unique selector markings. The pictogram that represents the “fire” selector position is engraved at 68 degrees from “safe” rather than the standard 90 degrees. This makes the markings compatible with 90 degree selectors like the BAD-ASS and 45 degree selectors like the BAD-ASS-ST (Short Throw).
This will be the first lower receiver on the market that will be compatible with both the excellent 45 degree BAD-ASS-ST and the 90 degree BAD-ASS. I will share more details as they become available