Smith and Wesson Shield Magazine extension

This is a Smith and Wesson Shield magazine extension I designed for my Shield in 9mm. It is a work in progress still, will be making some small changes over the next couple of days. It extends the factory 7 round 9mm magazine to 9 rounds, or the factory 6 round .40 S&W magazine to 7 rounds, it might be possible to fit an 8th in, but I do not own a Shield in .40 to test that. The plug is to keep the baseplate from coming off the magazine when inserted in the gun, but it might require a little bit