I have the SD40, and love it. There are alot of parts compatible between it and the Sigma. Magazines for one. The base plate will stick out, but it's not horrible. It will also fit in the same holster as the Glock. I had an officer (PD at work carries a Glock 22), forget his pistol after his wife moved his stuff, and it fit his duty holster pretty well. I also have not had problem one from mine in about 500 rounds. The trigger will smooth out as well.