The last Semi-Auto I bought before they were banned under Massachusetts H.4885 maybe the last ever?
This guide details how to convert a Glock Model 23 or 22 from .40 Smith & Wesson to 9mm Luger using a drop-in conversion barrel. The process involves disassembling the slide, replacing the barrel and potentially the recoil spring assembly, and then reassembling. This modification allows for the use of more affordable 9mm ammunition and Glock 19 or 17 magazines, significantly increasing the firearm's versatility, especially in states with restrictions on certain firearm generations or calibers.











