I hope you didn't order a Glock 19 holster, it's too tight.

Which led me to trying my Glock 30 Serpa. My 2.0 compact 9mm with the 4.0" barrel fits real nice. The end of the barrel extends 3/16" from the open end of the holster. My ciphering says your 3.6" barrel will be recessed 3/16" inside. The frame fit is just a bit snug, but slides in and out smoothly. What I would consider a nice fit. Now I can stop looking for a holster for mine.

The Black Matte holster is 410530BK-R, and comes in the newer red and black package.