S&W 9 and S&W 40 Reference Model

https://odysee.com/@unseenkiller:d/Unseenkiller---Ergo-SW-G:3

The Smith & Wesson SW series, most commonly referred to as the Smith & Wesson Sigma, was Smith & Wesson's first venture into using synthetic materials in pistol construction, with high-strength polymer material for the frame.

The Smith & Wesson Sigma is somewhat infamous in the gun community due to its controversial history. The design of the original Sigmas were so similar to a Glock both in their design and operation that Smith & Wesson was sued by Glock over patent infringement. This resulted in Smith & Wesson having to make alterations to the design and pay an undisclosed settlement to Glock.

The Sigma line was replaced by the similar but substantially improved Smith & Wesson SD series in 2010.