Glocks aren't known to be the quietest suppressor host. A stronger recoil spring can help with that. I still use my g19 the most as my 320 won't even run a boosted suppressor.  Ive headd a lighter spring can help but haven't gotten around to it yet

Now if Surefire would just release a Masterfire compatible IR light (without laser).......

CZ Shadow 2 with an SRO and Surefire V is better.

Not gonna lie, my P320 Legion is  pretty much the end all be all of night hand poppers for me.

Got plenty of samples to play with from other MFG's too, still liking the 320 these days.

Interesting, thanks for sharing that experiment.
Could also be due to the longer barrel length of the M9 resulting in lower pressure at the muzzle.

As for the rails, i still prefer polymer because its lighter.
I would also argue that an RMR makes a better aiming device than a IR laser because its passive. If youre facing a well equipped threat, you should assume they also have NVG and that using your laser is creating a beacon ti draw all enemy fire on you. If we are only talking about targets that are ill equipped or dont shoot back, then an IR laser is hard to beat...but that sounds more like "best gun for shooting fish in a bucket"