I'm not trying to be contrary with these posts, but here are pics of a 2017 model with the old style mag release. A buddy of mine bought a new B last year that has this release and an undrilled slide / short guide rod as well. While most of the B's I've worked on were older, I've yet to see a new full-size B with the newer features you both describe unless it was an SA, newer SS model, or an omega. I know both of you guys are very knowledgeable, ThompsonCustoms advised me on my first pre-b project a few years ago. I rarely post here, and only added these comments to prevent the OP from buying parts w/o checking which platform he has. Sent from my XT1254 using Tapatalk