653g on my kitchen scale.
It will be a roomy M and better if you have a long torso/long arms. There are detailed measurements on the FRS site - link below. 5’11” 185 here.
Fits me well but not a lot of layering room.
I will ship it out to you if you want to try it on. It’s a great piece. I will take it back or you can ship it to the ultimate buyer if fit is a miss. Visiting Criscam 3/13-3/17 so can always retrieve then if you don’t want it and it hasn’t found a new home.
https://www.freeridesystems.com/sizing-specs