I use those extensions on 226 mags for my 228. But, beware. These extensions will only fit these high capacity mags with the correct floorplate footprint. I had to buy 6 diffferent 226 mags before finding 2 that had the correct size and shape floorplate. I considered filing some to shape them, but having two of these 15-rounders for my 228 seems enough for now. Afterall, it's mostly aesthetic/cosmetic.