Real-steel history S&W released is Sigma series in 1994, when the 40F model was presented, followed by a 9x19 mm version.

http://www.arniesairsoft.co.uk/?filnavn=/reviews/kwc_co2_sigma/kwc_co2_sigma_review.htm

These guns are very similar to Glock's and the Austrian maker raised a lawsuit that result in S&W paying an undisclosed sum to continue producing the Sigma with many features patented by Glock.