Glock Options
I can tell you of one part (that I know of) that works from a Glock to my SD40/SD9 - the slide takedown lever, the flat bar you have to pull down to take the slide off. Why, you ask should I need a Glock part like that on my SD? Because the Glockmiester sells an extended one making it easier to pull down on the lever so you can get the slide off. I remember the "early" days in Sigma history when the entire slide of a Sigma would fit on a Glock (and as I remember visa versa) - no more, BUT if you want the extended takedown lever, you can buy the Glock one and it will fit an SD and SHOULD fit the Sigma as well.