I'm glad you asked.
I bought a Colt .380 government model and a Mustang Plus II, I'm a dyed in the wool materials snob because I make aftermarket replacement parts for industry, so I hate plastic and aluminum in my guns.
The plastic trigger looked really cheap and the choice was either make a stainless replacement or sell the guns. I made one on manual machines (Lathe, mill) out of 303 and put it in my Mustang Plus II.
Then I got a call from a guy who does reliability work for police, some of them carry the small Colts as back ups.
He sent me a computer drawing of how he wanted some made and I made them up in our CNC equipment, the material is 416 stainless. I started a run of 100 and had to toss all but about 80 (Terrible scrap rate!), anyway, there are quite a few left and they are for sale for $40 each.
The gun in the photo belongs to a customer who bought one for his Colt and asked if one would fit the Sig.
It does.